It goes beyond rubbee powers it's toon force realm
Because he has the human form he wonr change much in normal form, his awakening is zoan like.
It is just "rubber power" only extended to a meta level. Anything becomes elastic, including the medium in which the story is told.
Personally, I don't have a problem with that, if you exclude (1) how we got here, which was underwhelming and underwritten; and (2) that it might be too early, storywise, for this sort of realitybending jump; it should have maybe happened in the second-to-last fight, either against IMU or BB, whomever falls first.
What bothers me is the nonsensical whitehaired transformation that has literally no zoan alteration other than the hair dye job.