Hmm, I think the thing about the difference between having non-dual experience/realization that is pre-stage 5 and actually realizing stage 5 anatta is that unless you elaborate more it's actually very tough to tell them apart. I certainly can't simply from that video.
yeah. nondual experience is similar, view is different. substantialist nondual refers or traces back to an ultimate mind/awareness/source. collapses everything to be an expression of an ultimate mind
phase 5 mind is empty of mindness, just process manifestation aggregates, no self or agent behind perception.
katagiri roshi insight is certainly anatta but ken wilber is still one mind