I follow you, but I read TFA as saying the complete opposite of that. To me TFA is illustrating that "white-vs-blue-collar" is something of a thought-terminatin

I follow you, but I read TFA as saying the complete opposite of that. To me TFA is illustrating that "white-vs-blue-collar" is something of a thought-terminating cliche, and that looking at the actual data shows that various jobs cluster in ways you wouldn't expect if you assumed there were two big white/blue categories. (Also I interpreted "standing/sitting" as basically being a catchy title - I think the author's premise is that all the axes he examined are relevant, not just the standing/sitting one.)