The american tankies have literally no knowledge on european politics. Communism is banned in the majority of countries in former eastern bloc and these bans have been spreading with the ongoing rise of extremism.
Also, I am not aware of any communist party, that is promoting marxism/trockiism (aka the "good communism" most internet commies advertise). They are all just anti-EU pro-russian stalinists wanting to re-establish the regime, that tormented our nations for decades in our history.
Well, yeah, I don't have problems with democratic/humanist marxists either. To me it just seems those aren't really the branches this law is against. I now realize my previous comment might have been overly aggressive, for which i apologize.