marcan of the Asahi Linux project got into a discussion on reddit about this, and says that when it comes to hardware, you just can’t know.
> I can't prove the absence of a silicon backdoor on any machine, but I can say that given everything we know about AS systems (and we know quite a bit), there is no known place a significant backdoor could hide that could completely compromise my system. And there are several such places on pretty much every x86 system
