I remembered that classpostures aren't classes, although I forgot the spelling of "Frostean" (the "ean" is from a third word and I tend to remember only the first two.)
I'm not comparing them to classes out of some belief that they are really classes: I'm trying to see how this fits and how it would modify earlier ideas.
So classpostures are not really classes (especially in a Marxian sense) and they are not subcultures: they are ways of relating to the overall culture?