Como é que se diz isto em Inglês (EUA)? How do you describe “workplace PUA”in English?
In Chinese, the word “PUA”we use is derived from “Pickup Artist”. We use this word in workplace to describe a boss who uses some techniques to psychological control an employee to work under bad conditions.

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Just to be clear, "manipulative" does not imply illegality, and it does not imply being bossy. Based on your example (and reading a Baidu definition of 職場PUA - "职场PUA指的是职场中上级对下级的精神控制。来自恋爱的“泡学”，职场上只是换了对象，即领导精准打击员工的自信，以达到从精神上掌控员工的目的"), "psychological manipulator" is probably the closest you can get in English because it accurately describes "精神上掌控", which would be translated as "psychologically manipulate" or "psychologically control." There is no simple "one-expression" exact equivalent in English, so you will have to say something like "this boss psychologically manipulates his employees to get them to do what he wants."

PS Again, I am not saying that 職場PUAs do not exist in America - it is just that it has not risen to the level of having its own expression. The current focus on workplace abuses in the US is on sexual misconduct with the "Me Too" movement.

PS I found this website that describes a boss as "manipulative," and also gave 10 signs, many of which overlap with your definition of a 職場PUA:

https://www.careeraddict.com/7-signs-your-boss-...

"10 Signs of a Manipulative Boss to Watch out For"

They undermine your confidence.
They use blame to control you.
They micromanage you.
They're gaslighting you.
They never praise your work.
They use intimidation.
They take credit for your work.