Basically, yes. It might be possible that they can get a plurality but I doubt they'd do as much with it as in the past.
edit:
How it happened in the past is a Communist was elected to a key position as the head of police, purged the police and replaced them all with communists, and followed up with a coup. There is a certain worship of people that were part of the StB (Czech KGB basically) because some people think that they could do this again. I'm more skeptical of it due to the EU being a thing.
Basically, yes. It might be possible that they can get a plurality but I doubt they'd do as much with it as in the past.
edit:
How it happened in the past is a Communist was elected to a key position as the head of police, purged the police and replaced them all with communists, and followed up with a coup. There is a certain worship of people that were part of the StB (Czech KGB basically) because some people think that they could do this again. I'm more skeptical of it due to the EU being a thing.