Its a big club and you're not in it (well maybe YOU are, fucking redditors) 
Woody Allen is the most bourgeois filmmaker I've ever seen. Can you name a single black person in his countless whitewashed movies about "iconic New York City"? There's the one sex worker named "Cookie". It makes sense that PMC class character would make even Jewish people hate their black neighbors as much as white nazis in suburbs...that actually explains a lot about Hannah Arendt's contempt for eastern European Jews in her holocaust revisionist journo propaganda lol
I think this is a more functional analysis of what the PMC thesis is trying to get at but I would say it doesn’t cleanly map to a Marxist class definition and instead fits more cleanly with the ‘elites’ school of class analysis that posits a strata at the top of the classes that guide and lead them. These elites hoard wealth but also skills (like in your excerpt) and influence. The labor aristocrat thesis fits in with this as well wherein you have highly skilled proletariat who recognize their individual benefit from hoarding and then carteling their skill set away from other workers (trade unions bad actually). This hoarding behavior is also super prevalent in bureaucracies where chokepoints of expertise develop and allow individuals power beyond their station. I could see why the author would be critical of China or really any existing-socialist state as they’re very prone to this skill trap (see: late USSR).
My issue with the PMC thesis is that it’s underdeveloped, not that it’s completely off base