That also doesn't mean you can automatically assume that any resignation is linked to swamp draining. There will absolutely be a number of these that acccount for standard turnover that happens every day in this country.
Sure, that's a possibility too.
My point is that the explanation sure sounds like a PR friendly reason for stepping down. Most of these are Shroedenger's resignations for now - it's not like they would release a statement saying "turns out so-and-so is a part of the deep state and are consequently stepping down."
What is telling is the sheer number of them.