The Soviets started with genocide before the Nazis even arrived: https://en.wikipedia.org/wiki/June_deportation

And continued after the war: https://en.wikipedia.org/wiki/Operation_Priboi

You're venturing into Holocaust relativization here.

He's not the one denying genocide here. He's pointing one out that you're stubbornly ignoring.

He literally said the Soviets “started with genocide before the Nazis even arrived” and then listed three things that aren't genocide, as a way of downplaying the fact that the Nazis planned to exterminate most of the people in Eastern Europe. Baltic peoples, Ukrainians, Poles, Czechs all exist today. That would not be the case if the Soviets had lost the war.

That really depends on how you look at it. By that argument, to Ukrainians, the Nazis were the liberators. The Soviets had starved millions of Ukrainians in the Holodomor, and many, including the infamous Stepan Bandera, erroneously saw the Nazis as liberators. Thing is, liberation requires actually being free afterwards. Neither the Nazis nor the Soviets were liberators. They just replaced another oppressor.

And sure, the Nazis were even worse, but we should really stop pretending that the Soviet occupation was great.

The Nazis murdered millions of people in Ukraine. They were only "liberators" to the minority of fascist collaborators: primarily the OUN B.

The Soviets were nothing like the Nazis at all. The Nazis would have murdered virtually everyone in Eastern Europe.