Note that he is a mathematical economist with a PhD (focusing on game theory), and also a self-proclaimed Marxist. So his ideas and perspectives are very interesting, to say the least, and at times very unique.
I don't think he can be nailed down to Marxism or any other -ism. He seems to be part of a eclectic gang of economists that find insight and inspiration everywhere, by simply putting reality ahead of thought models.
Marx was writing when it wasn't even called economics. Hayek was fine with empiricism, you may be thinking of his later followers Rothbard and von Mises.
https://www.youtube.com/watch?v=ytXgMnm9tHs
Note that he is a mathematical economist with a PhD (focusing on game theory), and also a self-proclaimed Marxist. So his ideas and perspectives are very interesting, to say the least, and at times very unique.