That explanation doesn't work.

They advocated for competition instead of ogliopoly. You decided to talk about a completely different and irrelevant way there could be a lack of competition. Even if your conclusion is right, that they would be against communism if it was a realistic threat here, there was no reason to bring it up.

I could say that a bunch of badly placed volcanos would reduce competition and they must be against those volcanos. Such a statement is technically true but it's a non-sequitur.