China is communist in name only these days.
Vietnam today might be even less communist than China.
I would agree that Vietnam is probably less communist than China. That doesn't really impact my point.
That is the key component of all communist countries we have had experiences of it but in theory you could see a country adopting a communist constitution and multiple parties fighting over elections to govern and decide on the specifics. So it is not really a key component of communism.
Human greed makes it so that it wouldn't last for long though.
You can split hairs about marxist-leninist communism and politburos and some sort of pure economic communism, but that mostly seems like pedantry.
Your point is that all red cars with a prancing horse logo are Ferrari. What I am telling you is you will find plenty of red pontiac fiero and toyota MR2 looking like Ferrari up to the prancing horse logo from very far away but when you go much closer or hear them revving it quickly become obvious these are body kits on top of cars that don't have a single genuine Ferrari part inside.