Clif High has a theory that Trump is using these info drops to judge where his base is at as far as support goes. You can see his theory in this video starting about 31 minutes in:
I don't entirely understand why he's not taking more credit for it. He seems to be caught between taking credit for the cure and denying that there is anything serious needing to be cured.
A rematch is, at this point, a toss up. It's a long way to 2024 but it's not out of the question.