I have a few problems with this:
Given what we know, to me, Ikemoto's intent with Shibai was to create a being of all-encompassing power (called a peerless existence within the story already) in the Naruto universe, something whose relevance extends beyond the Earth and more to the scale of the Otsutsuki themselves, planet-eating, basically Demi-God Aliens who operate across the entire universe. (It's pretty common for Authors when trying to make an infallible being to grant them jurisdiction over everything the main cast can fathom/directly interact with)
This makes sense, but IMO is ultimately a weak argument if you're arguing for something as specific as Low 2-C in the absence of some very key pieces of information.
Which is pretty consistent with Shibai's ascension to a higher Dimension, Divine abilities that have already been stated or implied to have tier 2 range (Senringan and Prescience), with Omnipotence being the one that surpasses them all, quite literally being called the "Shinjutsu of Shinjutsu" or "Divine Ability of Divine Abilities"
Okay, one small problem. Senrigan does not have "Tier 2 range" at all. I just checked, not only is it not accepted anywhere here, but the fact is that it CAN'T have Tier 2 range at all. Interdimensional sight doesn't grant you Tier 2 range on its own, and the ability to see in the past doesn't either especially since it's not seeing into the infinite past (which would be Low 2-C) but instead only up until her own birth, so yeah this isn't Tier 2 range. Also, this would give literally anyone who can time travel Tier 2 range/hax, I don't think we can grant something like this. As for Prescience, seeing 'all possible futures' (ones that are, as we know, not even actualized) is really not a strong argument for Tier 2 range either. I can "see" 10 different future right now, as I'm typing this, about what can possibly happen in the next 18 hours with me, that doesn't grant me Tier 2 range especially since this was just in context to the fight with Naruto and Isshiki. Still, the main point I'm trying to make here is that these abilities are different, and just because Omnipotence predates/preceeds them doesn't mean that the
creation ability of Omnipotence also has Low 2-C range/potency.
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Also, Shinjutsu's direct statements of being the programming language for the reality of the Otsutsuki Gods. And the fact that Earth as a planet is so insignificant to the Otsutsuki that it was allowed to exist for thousands of years as the current Otsutsuki travelled across the universe in search of planets to absorb, and wasn't even a place of significance to them until it eventually became their target many millennia later.
Sure, but you do realize that Otsutsuki still existed on a planet within the universe right? And that this whole "there's another universe where another God originated from who created this universe we're talking about now" is purely conjecture, theory-crafting made solely to try and make some sense of this extremely hyperbolic, nebulous and vague statement right?
And as I've stated in my previous comment, Momoshiki's "How many times do you think Humanity has had its memories manipulated", doesn't strike me as a comment saying that an Otsutsuki God went to Earth and messed with humanity specifically; that doesn't really make sense with the rest of Otsutsuki lore.
It doesn't, and yet here we are. The statement says exactly that. Now what?
Considering his very last statement prior to that was how Omnipotence essentially allows you to manipulate the building blocks of Reality, it seems more like Momoshiki was just trying to appeal to Boruto's sense of scale.
I have a problem with this argument being used again and again. Let me give an example, we accept that most fictional verses are made of atoms. At some point a lot of them even outright say it. And of course, a lot of fictional works also have characters that are explicitly capable of atomic manipulation. Does that now grant them Low 2-C range or potency in their abilities and/or hax, purely because they can manipulate the 'building blocks' of reality? I hope your answer is that it doesn't, because that's fundamentally what's being argued here.
More straightforwardly: "This ability can affect reality itself; think of all the ways humanity has likely been affected by this in the past."
I don't think Sekai, in this context, being one individual planet, makes sense here, given the scope the Otsutsuki generally operate, the scale of these other Shinjutsu being all encompassing on a Universal scale, and Shibai's status as a "peerless higher dimensional being", with Omnipotence being the ultimate Shinjutsu of said peerless being.
Well as I have just stated, other Shinjutsu really aren't on that scale either. At least one of them clearly isn't and even if they were, they're different abilities (Omnipotence isn't creation, but just something that it's capable of among other things) and it's not a good argument to say that they all have the same range without strong evidence.
And while I do think I understand where some fellow staff are coming from, wanting a statement that directly says "an Otsutsuki God created the current Naruto universe with Omnipotence.", but I believe we already have been given enough from the lore to come to a conclusion.
At worse I can see a Possibly Low 2-C if other staff have a similar concern over very specific verbiage or lack thereof, as KT and Damage do.
I personally still am of the opinion that this should be left untiered until we have better information in the near or distant future instead of half-assing it this way IMO just because we're unnecessarily forcing ourselves to accept the highest possible interpretation of some terms that, if I'm being honest, are pretty vague and up-to-interpretation of the reader.