I mean, I'll have a bash, because I did personally do a double-take when reading your posts just then.I consider equivocation between the USSR and Nazi Germany to be Holocaust denial.
On the whole, the USSR during WWII was not Nazi Germany. Even Mussolini's Italy wasn't and that had far larger overlap (and more responsibility for any shared crimes). But from the perspective of the USSR's victims, it can be argued there isn't a huge amount of difference. I checked on @EvaDK's post for example, and it looks accurate. I certainly wouldn't call a cartoon depicted armed forces oppressing civilians as indicative of Holocaust denial, for sure (unless there's some other context I'm not aware of).
Now, I get that in this thread people are taking some really silly sides, to the extent I was accused of equating Russia and Ukraine in this invasion (shout out to @Verbose who never replied), but I think you might also be reacting a bit in kind here. Or - again - maybe there's specific context for you that makes it make more sense (connections the argument in the comic may have to established Holocaust denial / revisionist arguments, and so on).