Those Russian speaking separatists got heavily influenced by Russian disinformation and propaganda for years in preparation of the invasion, and supported by the Russian armed forces, precisely to have this justification. This is like saying Putin got 88% in the election, so clearly that's the will of the people. Assuming that authoritarian regimes lead by secret service agents play by the rules of democracy is dangerous.
Imo it's remarkable how successful they are at spreading their twisted narratives, even in western countries.