I agree with you on every point and would like to add that the writer of the article appears racist when he calls it "white" music, heck, does he listen to classical music or is Bach too white for him as well, Jesus. However, I do agree with you and this author that it is white and nerdy type of rock music but as you said there's nothing wrong with it. Heck, is the author trying to make a critique or is he stating the obvious when most of prog are 10+ minutes songs about either some weird sci-fi space shit (like oh.... Starship Trooper by Yes) or some older times like the Middleages(albums like Lizard by KC) or like Nimrodel by Camel about Lord of the Rings, man. I mean, it's not really subtle but that is what prog is about. Considering all of this there are good and interesting prog songs from non-white people(if this is important to this author). What you said, Prog never pretended that it was something it was not, I mean it was, and probably still is ridiculous and over the top but isn't focused on being cool or "hard" and political messages. In a video the somewhat famous music critic Lester Bangs talks bad about Jethro Tull and ELP and other prog because for him too, he didn't see the point and I'd assume that it's not cool because well... Prog is about music and nothing else (it does feature some great/ridiculous performances and weird costumes(which I'm all for) but it was always about individual freedom and imagination and never purely about some social revolution like punk pretended it was, if folks want that go read a damn book I'd say).