Will we ever find out what transpired during “that meeting” in Mar-a-Lago?

Probably not likely. But..
I agree with this comment from a Spitballer:
“I doubt we will know. But I do know that the conversation started something like this, “Kevin here is what you are going to do…but, but, but…
Kevin you’re a smart man and let’s just say you don’t really have a choice.
... and Kevin, here’s what I know about you and this is what I need you to do.
Be a hero not an enemy. “