Well, I don’t think calling it illusions is correct.
It’s more complicated than it appears? Sure. “What you see isn’t all there is, and some things may not make sense even if you try to understand it” absolutely. But to say “illusion” is implying that there’s a reality that if you just buy this person’s book or watch their videos, they will grant you access to the truth behind the illusions. But the truth is as much of an illusion there because it’s based on the same illusions. That’s why I think using illusion isn’t terribly helpful (except to sell books)