I know a couple of communists and I can tell you they are pretty prone to infighting, the amount of variants of communism is baffling, marxism-Leninism, Maoism, hoxhaism, Titoism, Trotskyism, anarcho-communism, Stalinism, the number of variants is outstanding, and most of the dictators they are named after are also huge lolcows, but I think this man might've been thinking of this when talking about communism, basically discounting every other autistic variant of socialism/communism/whatever, and focusing on the soviet union, maybe the warsaw pact if we stretch it.
TL;DR: He discounted everything else because "It's nOt rEaL cOmMuNiSm"