I'm curious what kind of answer you would consider "not PR drivel." Specifically, if sounds like there is nothing Bill Gates could write that you would consider genuine.
Some kind of personal anecdote or something that is even remotely specific instead of that generic comment that looks like something that was written by the same people who write apologies for Facebook.
Why should he have to annotate his personal beliefs with anecdotes and specifics?
"I pay way too little in capital gains tax and it is a thorough shame that nobody in Congress has fixed this issue in 30 years. In fact they've made it worse"
He did write something that amounts to that, just with more words.