It depends on how you look at it. He’s an ally to Chinese communists because they share military and trade relations and are only friendly terms with each other. He’s not an ally to them if you look at it ideologically because he considers communism a failure and inferior to whatever he has going on. And perhaps the Chinese don’t care at all that’s he’s anti communists because they care about the material support more.

I doubt Xi’s Marxism Leninist ideology is ever on Putin’s mind, the same way MBS being a literal monarch is likely not on Xi’s mind. It’s not really about communism vs capitalism anymore. It’s about markets and whose guns will be on your side or out of your way