It doesn’t matter, he now leads the country and probably wouldn’t have with the communist party. Unlike the democrats, it appears in is possible to shift this party left. Obviously this doesn’t mean they’ll shift to a planned economy or something, but there should be better policies.
Fico was in the communist party too though. I think this is basically as far left as they can go while actually participating in the system. I think this is a very positive development overall.