What he expects is for the western left to take itself more seriously if it's to have any success at all, and dodging critique by hiding behind "it's a site for memes" isn't doing any good to anyone that actually wants change.
Not "expecting too much" from a link aggregation site is like not expecting too much from any western communists. The masses are online and online spaces are not separated from "real" life like that. No one is saying we can't have any fun, but at the end of the day If we don't take ourselves seriously why should anyone else take us seriously.
While I do find lemmygrad a bit better than hexbear in regards to this, it also still has an abundance of low effort meme posts and a lack of serious discussion.