No, there's no world in which he is. Fraud on this level will see massive forfeiture as directed by the SEC and DOJ and then civil suits will clean up anything left afterward he's released from prison.
When you're hitting at that level you can't hide, not anymore. Maybe in the 70s. Countries without extradition aren't usually the kinds of places you want to go these days, and people there are bound to know who you are and shake you down when you're a globally known rich guy.
Yes having bitcoins is just having a private key. In 12 or 24 words format a wallet can even be memorized if needed. The blockchain is the global ledger of how much money there is on corresponding public keys.
yea, but probably not with gold. Besides dealing with the physical difficulties of it, it was a crypto exchange after all which also just got magically "hacked" when things started to go downhill. sure getting out that crypto isn't the easiest but likely easier than millions in gold.