He is right in one case, behind the Iron Curtain, the Holocaust was explained away as Anti-Fascist opponents of Hitler were the ones killed, and that Jews weren’t necessarily singled out. Only when the Wall came down, did those behind the Iron Curtain began hearing the full truth.
There’s a movement in loony anti-Israel circles that claim that Hitler only killed anti-Zionist Jews (and was supported by Zionists). It takes all kinds.