I'll humor this, though take my word with a grain of salt as I'm a bit rusty on my Persona Knowledge atm
I'm assuming that what Lavenza is trying to imply is that this is a general threat to the collective unconscious (Of which the Velvet Room is a part of iirc), which would still result in Tier 1 scaling, as that's a big crux in why the character's are that strong in the first place (The CU contain's all Persona's as it is The Sea of Soul's, and pretty much all of those Persona's tend to scale to their SMT Demon counterparts, of which many are Tier 1; The CU itself is beyond the Corporeal World as a Structure made up of Cognition and the source of Human Existence itself), so these beings should all still be in the Tier 1 Ballpark- And factoring in scaling with the PT's, they would be Tier 1 as well.
Of course I am assuming that Lavenza meant the CU, she could possibly be talking about something else, but that's the safest guess I can really muster. And endangering the VR implies you could possibly endanger the CU anyways iirc (Again, a bit rusty so if anything I say is false or inaccurate I apologize).