I mean honestly that's somewhat an irrelevant argument. Falspawn imo is a much better name in english, as the term "darkers" sounds awkward in english. Mother Cluster / Mother Corps is also just a sensible change. Same goes for Double > Gemini
I think a more problematic change would be Tensei to Celestia in spite of the uniforms clearly saying "Tensei" and the uniforms having a large, obvious (albeit stylized) "T" (which they're apparently trying to pass off a backwards "C" even though it looks more like a "T"?) while "Mother Cluster" is seen in an ingame graphic, it's only shown once.
I do agree with the fact people should be complaining about TD2 when their complaint is "all the content" btw.