Where's my explanation?

DO NOT RESIGN, if he doesn't want you their, he has to fire you, don't give him a valid reason

Ideally, the OP can find another job and quit this one before getting fired.

there

Promotions are a trap.

Often you get a little more money, but you also get a lot more BS duties and you're subject to a lot more scrutiny.

Hopefully, you'll find another anthropomorphized business that "feels" like it needs you.

So they are trying to force you out of the door without getting redundancy? Maybe they have someone they want to put into your role but can only do that if you are gone first.

Congratulations your unemployed what do you want a medal.

Someone else is after our job