I've thought long and hard about WWII might be celebrated in Russia ITTL. I think, if a rational government takes control of Russia ITTL, then it might not be so celebrated.
The post-CNS government will do everything in their power to discredit Stalin, and they may do this by pointing out the not-so-triumphant parts of the Second World War.
One way to do that: Molotov-Ribbentrop. OTL, Russians see World War II as a great triumph, a time when they fought back against a great evil, and helped wipe fascism from the face of the Earth. But this obscures the fact that at one time, Stalin was perfectly willing to work with the Nazis (previous posts indicated that the brief Nazi-Soviet détente will be emphasized), selling them oil, and working with them to take control of Eastern Europe.
I imagine that the CNS will also emphasize Stalin's military mismanagement: how purging his military, wasting resources fighting Finland, and his willingness to ignore numerous intelligence left Soviet Russia vulnerable to the Hitler's invasion. So vulnerable that twenty million people died.
They might also emphasize how the Soviets frequently sabotaged the Allies for their own gain, like not doing more to help with the Warsaw Uprising.
And finally, there is their post-war occupation Europe. There is the Soviet pogrom, which discredits the idea that the Soviets liberated anything, but then there was oppressing the workers and peasants of Eastern Europe so badly, they revolted militarily to get out from under the thumb of the Kremlin.
ITTL Russian students will not learn about how their ancestors fought heroically to resist the Nazi horde, but how a vicious idiot from Georgia helped that Nazi menace grow stronger, weakened his army with purges and mismanagement, ignored that very threat to the peril of millions of Soviets, sabotaged his allies for personal gain, and then proceeded to throw the goodwill of victory down the drain by being an oppressive, backstabbing douche. Underneath the victory of Soviet Russia, there is a good deal of shame and stupidity behind it.