Not just technically true, but the reality for vast areas such as the Ukraine and Kazakhstan etc which existed even then. There were numerous cities such as Vilnius or Dushanbe where most of the population did not speak Russian as a first or even native language or consider themselves Russian. It's like when people watch/read "Hunt for Red October" and call Captain Ramius a Russian... He isn't one, and it's a pretty key plot point that he isn't one, hence he defects.

Oh yes, ofc, I have forgotten the 100mio who died of Communism. My bad! Funnily enough, the millions of soldiers who fought for it against nazism are counted as part of the death-by-communism. Same for the aborted babies, or the pedo and fascist filth who were rightfully imprisonned. Basically, everyone who dies under communism dies because of it, right? Unlike those who die under fascism, or of malnutrition, or of cold because they are unhoused by the West, those dont count towards death-by-capitalism, obviously.