Yeah, except Marx invented the proletariat, lumpenproletariat and petit bourgeoisie.
The key is that he used those subgroups to explicitly pit them against one another, whereas practical progressivism tries to solve issues within subgroups because society as a whole is not going to magically change. White people aren't suddenly going to refuse the privileges that they have based upon their cultural place in society. I'm not going to, for example, tell the cashier to check my $20 bill after having just checked the $20 bill of the colored person in front of me. I'm going to sigh as they put the $20 bill in the register without even giving it a second thought and maybe hate myself a little for noticing that and not using it as an opportunity to teach a lesson, because the cashier probably wouldn't even know what they did, and I'm timid in real life.