Except he’s not promised to not do the same. He’s promised to try and change who he is.
It feels like you’re beating up on the equivalent of a dude saying he has a problem and going to AA because he’ll just start drinking again and that we shouldn’t believe he wants to stop drinking at all.
I think we’re all aware that changing things about yourself, especially things you see as serious flaws, is hard. And that backsliding is possible. But I’ve not seen any evidence that he’s anything but sincere in what he says here - he is who he is, and he’s unhappy with that and he’s trying to change it, but it’s not gonna happen overnight!
