Well hes thrilled that Beyond has a Gay character, but he isn't happy it is Sulu, because Gene intended Sulu to be straight, and Takei thinks they shouldn't mess with that.
I don't think that's really about Roddenberry so much as about how an actor tends to build an inner mental model of who his character is in order to build his performance. I've seen other cases of actors resisting changes to the characters as they understood them, because they were just too attached to the version that existed in their heads.
I mean, it's not like Roddenberry himself was opposed to changing his intentions. He was the one who had the Klingons redesigned for TMP and asked viewers to pretend they'd looked that way all along. Creators are generally far more willing to change their own creations than you'd expect. After all, the process of creation is itself a process of change, of trial and error and refinement.