So instead they leave backdoors in thousands of servers, affecting almost 30 U.S. companies, storing personal and private data on millions upon millions of people?

Even if the US military wants to keep them in place, as to "not to tip off the Chinese", I'm pretty certain those companies CISO's would not go along with that.

All it would take is just one guy with access to the hardware to leak a sample of this imaginary "Chinese super chip" to then make the story: "US military forces US tech companies to keep Chinese spy-chips in place", the blowback to that would extremely nasty and uncontrollable.

Sorry, but no matter how "The Big Hack" is spun, it remains a prime example of FUD [0].

[0] https://en.wikipedia.org/wiki/Fear,_uncertainty,_and_doubt