I disagree with most of that. Jugram clearly says he couldn’t see the future when the poem ended, and Yhwach himself admitted that he lost his vision after talking to Ichibei. So the idea that he could still see the future without the Almighty doesn’t really make sense to me.
Even with Ichigo, he explicitly turned the Almighty off, he either sees the future or he doesn’t.
It makes much more sense that, in the distant past, Yhwach, similar to the old Soul King, glimpsed thousands of years into the future and used that knowledge to craft a very specific plan, timing everything perfectly to counter Ichibei and get the Almighty back, knowing already he how and where he would die.
This explain his plan and his confidence to attack S0 in that specific way to then go to the SK and align with Kubo's subtle writing more.