Words can have different colloquial meanings. There is a really crass meaning of liberal that would identify Marx as a liberal, yes, and this is the most popular one in America, but there's another colloquial meaning (more popular in other anglophone countries, but gaining traction in America) where liberals are basically centrists (in capitalist societies) who might pretend to be progressive but are ultimately moderates to their bones. This came from the proclivities of "Liberal" parties, along with centrists understandably claiming the name of whatever the ruling ideology is, and here it is of course liberalism.

Among leftist circles, "liberal" is sort of an unmarked term for the moderate definition and the Lockean definition both, like how "guys" can refer to both a group of males and a group of mixed gender, despite "gals" only referring specifically to a group of females (I'm using those terms because they apply to children also, not just men/women).

So the comment is saying, in translation: "Democrat aligned people will still blame socialists (etc.) like their Democrat ideological cult wants them to." Does that make sense?