I got into this out of self interest too. I'd be surprised if there are many people who didn't.
Except that for most of us the self interest is for our group, for women, even those we consider too militant. Whereas for DH the self interest is for DH himself.
He says so quite clearly. He presents himself completely disingenuously. His narrative is along the lines of: I know I'm male, I like it when people use feminine pronouns for me but I'm not bothered if they use sex-accurate pronouns, 'cos see I'm so nice and reasonable that women will let me in, but those nasty extremist TRAs are spoiling it for me.
So, while I'm glad he speaks up and peaks others, I don't think he is in any way an advocate for women's rights.