I have seen my fair share of tankies here, so there definitely is a presence of them here. But I also do think a lot of the complaints come from people who assume any leftist user or post is also a "tankie."
Like I do see a lot of leftist memes posted to [email protected], which might be where a lot of the complaints are coming from. Likewise there has been a lot of drama with hexbear federating with a lot of communities that were previously shielded from them.