They have a well documented history of combining general ignorance and incuriousity about a topic with willful misrepresentation of the facts to push a political agenda. You can probably research the specifics on your own. I don't think anyone is accusing this particular article of serious bias, it's just that everything coming from Polygon is automatically suspect because (A) they don't try very hard to report accurately, and (B) they are sometimes dumb on purpose.
Oooh, I see. Polygon has published a few pieces about fair representation that hurt the feelings of basement-dwelling "SJW haters", so it is now a disreputable outlet.