The identity of the "high profile man" is subject to a non-publication order until at least the end of July when there's next a hearing into the matter. And I don't want to put either Mia or Nath at risk by sharing it here.
But it's not too hard to find who it is if you go looking. And holy shit it's a shocker.
My biggest question is: if you're the person doing the alleged extortion, why would you extort some rando, rather than the very wealthy high profile man with whom she was allegedly having an affair? He's got the money to extort, and he's the one with more of an image to uphold.