You can critically support the existence of Rojava while also recognising that ultimately accommodation with Assad is the only viable option and that the alliance with the USA was a stunningly bad idea in the long run.

I mean that's what critical support is, you critique the dumb shit AES does, not to dunk on them but so you and others don't make those errors should your turn come around. The Soviets also supported Israel in the beginning, before the true nature of the state became clear and the atrocities couldn't be sweeped away as the "excesses" of a traumatized people.

Do I think that China should have made detente with Nixon instead of mending the split with the Soviets? No. I think it was fucking stupid despite the Soviets being in the wrong. Do I still think China are comrades acting in good faith. Yes.