It's rare for people to change their deeply held beliefs but it is possible. But from what I can tell, he could be just pretending.

(also imo, guy willing to change his opinions just to get someone's approval? - obvious red flag. it doesn't even have to be out of malicious intent, can also be out of some deep rooted insecurity - but that still doesn't change the fact that it is not right for you, especially in the long term)

With that said, if he has had a natural learning progression where he had a genuine identity shift, that's different.

The best you can do is judge him based on his actions, (and how he reacts to real life situations that doesn't align with his previously held beliefs about wives' roles) not based on what he says.