> and then goes back and
quietly rewrites it later and has his buddy approve it.
Emphasis mine. I think "quietly" is the key:
He quietly rewrites it and quietly gets his buddy to accept it.
My guess is he scared away a new hire recently by some comment on their PR and is doing his best to avoid doing that mistake again.
Again, quietly is key here.
I've dealt with some people I'd consider brilliant a$$holes and this - as far as I can read - is quite far from it.
(I'm not judging on if it is a good or a bad idea, only that I'd surely take it as a sign that he wants you to stay and want to avoid embarrassing you.)
Edit:
Re-reading it this caught my eye:
> I don't want this to be about the fact that I am a minority in tech
This makes me even more sure about my conclusion. He wants you to stay and is afraid that you'll leave if he is too direct.