On content: they were saying that bringing up Lysenkoism and saying communist societies didn't actively WANT to have famines was the equivalent of Holocaust Denial (which I don't think it is, the Nazis were pretty intentional in doing the Jewish Holocaust).
On context: Yes this was part of their work moderating a TankieJerk community.
I don't really get people who are bothered by Tankies, during a time of rightwing fascism. Tankies are such a small minority that they're pretty much irrelevant and can be easily avoided or ignored as inconsequential.