This is a good comparison because I also oppose car-dependant infrastructure and think we would be better off with more public transports and an infrastructure closer to the people in general.

I suppose I don't get why someone who claim to be communist would adhere in any way to capitalism knowing full well how much harm capitalism bought about.

But then I'm an anarchist so it's not that surprising to me that a state would perpetuate oppressing power structures such as Capitalism or Police forces.

China is not communist, it's an authoritarian state doing state capitalism and performing ethnic cleansing/genocide. It's quite far removed from the ideals of communism.

That's because that's just Russian propaganda used to justify doing imperialism and conquering Ukraine.