The issue is not 'ignoring' soviet crimes. The issue is that the game's story takes a grain of truth and twists it to absurd levels and the result is a caricature- and stereotype-laden portrayal of the soviet union that rivals the worst of not only cold war-era hollywood, but, in some places, Goebbels himself.
You might think it's not a big deal, that people are over-reacting, etc. But there is not a single family in the former USSR that does not have a living memory of loved ones who suffered immeasurably during the war. And the way this game depicts events and distorts reality makes mockery of that generation.
And apart from this, the sad fact is that, even though it is 'just a game', a fictionalised portrayal of history, much of its audience is not going to know any better. The eastern front is traditionally little-known to the western public anyway, and so, like it or not, there is a degree of responsibility on the developer to depict the events in a dignified way, even if they are fictionalised. You do not even need to white-wash anything or go out of your way to give a positive spin -- like the guy in the video said, Red Orchestra offers a very good depiction of events. It is not pro-soviet; it is just dignified.
CoH2, however, just falls into dumb stereotypes and sensationalised depictions of a reality that is so brutal that it does not need embellishing. It belongs with the rest of the 'creative' Orientalist trash that has consistently belittled and degraded non-westerners. That it does so unintentionally just points to the developers' ignorant and reductive worldview.