At some point they were 90%+ ex-CPSU members, and somehow they are still not communist?
90% communist, and still not communist? Well, lets call them 10% non-communists then, if you want.
So? China's actual Communist party isn't exactly very communist anymore.
I'd say the CPSU is dead, but some of its members who liked power shifted with the political winds.
I'm not as familiar with Russia, but it wouldn't surprise me if Putin's ideology is power-for-its-own-sake and nationalism, in that order.
What is communism? Peace in the world, and utopia for workers?
Or more like mafia-serfdom-militarist system, where actual proletariat are put lowest of the low, and abused by everybody on the party ladder, and what USSR actually was for most of its history?
The CPSU never, ever cared for one, and even lowest tiers in the party were fully aware of this.
In this, it's true that the communist party of the soviet union never ever been the dictionary definition of communism (which they themselve defined) It was a cynical kratocratic cult without any morals.
There were people that literally read Friedman and wholeheartedly agreed that were in the CPSU.
Hell, Yeltsin was the 7th most powerful man in the CPSU. He wasn't much of a communist.