Seems to me that you and ChristianKl disagree on how many specific details can one remove from Marx and still call the result "fundamentally Marxist". Specifically, whether you can remove "class struggle" and replace it with any "X struggle" (such as gender struggle or race struggle or otherkin vs non-kin struggle).

I suspect that you could both more or less agree that identity politics uses similar rhetorical tools as Marxism, only replacing class struggle with other values of X. And that the thing you disagree at is whether the rhetorical tools themselves should be called "Marxist"; because for you "Marxism" is in the rhetorical tools themselves, while for ChristianKl "Marxism" is the specific application of those tools to the class struggle.

Or I may be completely wrong here, but this was the first impression.