I don’t. And I suspect that lots of people who consider themselves Marxists object to Chris Dillow describing himself as such.

I find it interesting that you believe Marxism is more comparable to libertarianism than liberalism.
I agree with you, and I think the mix-up of all these labels is absurd.
Take George Orwell. His suspicion of the state leads libertarians like to claim him as their own, until the Left “corrects” them by informing them that he was a self-described “Socialist “. But Orwell actually favored “The idea of an earthly paradise in which men should live together in a state of brotherhood, without laws and without brute labour, [which] had haunted the human imagination for thousands of years.”
A paradise with no laws, but still plenty of brotherhood (i.e. charity, volunteerism, etc.), reminds me more of a “Marxitarianism,” not a bailout-junky leftism.