The actual heavy handed Russification of the SSRs was pretty much exclusively a trait of the Stalin era. Lenin himself greatly championed the rights of the national peoples of the Union (as mentioned earlier, the Korenizatsiya) and the Bolsheviks themselves stopped the old policies of Tsarist Russia which made Stalin's Russification look like sunshine and rainbows in comparison. After Stalin's death, Khrushchev rehabilitated many of the deported peoples, stopped the deportations, and eased off on ethnic and linguistic restrictions throughout the USSR. It is true throughout the rest of the USSR's existence there was a preference for people, particularly party members and bureaucrats, to understand Russian as a language but this isn't really repressive nor unique to the Soviet Union. Even countries such as the UK, Germany, France, and the USA today expect that you can proficiently use their native languages and educate their kids in said languages and in many professions is outright required.
Was the USSR racially repressive at certain points in its existence? Yes. But to act like it was some dystopian megalomaniac genocide state that wanted to absolutely vaporize every man, woman, and children that wasn't pure blood Russian is just Cold War boomer-tier propaganda.