As an ousted President, how can Trump still claim executive privilege?

[FBaggins]

27. Remaining confused is actually a good sign in this case

There are scores of academic papers arguing this very point and there obviously isn't a bunch of clear evidence to go on because it only comes up in highly politically charged situations.

The key takeaway, in this case, is that just being able to make the claim - even for a sitting president - doesn't mean that you'll win in the end. It is widely accepted that presidents need confidential communications with their advisors in order to be effective, but it's just as widely accepted that it shouldn't shield them from criminal liability, congressional oversight, etc. So each instance is to some extent a new argument in that clash that depends very much on the specifics.

I haven't seen the specifics driving your question... but my guess is that Trump doesn't expect to win the claim. He's satisfied that losing it will take a loooong time, and that's enough of a goal to justify the attempt.