I will not spend hours of my time researching and writing a detailed reply for someone that thinks PoW can be masked as PoS. I know the fundamentals of software engineering and blockchains, and those are enough to explain why you should take the devs word about ethereum being PoS. How the staking mechanism works is irrelevant for this discussion.
Maybe I should've included the small explanation in my first reply, but given the other commenter's attitude I doubt it would matter.
You didn't downright say that they lie about being PoS, but you said that a third party must confirm it, which is an equally bonkers statement. You can check my reply to the other commenter for a small explanation on why that's true.