Again though it wasn't just a threat - it was a very specific if/then statement - "I've arranged it so that if he has me killed, he will be killed."
Granted that it's a bit unsettling, my immediate response, and IMO the likely immediate response of virtually anyone and everyone, would be "But I don't intend to have you killed."
This isn't analysis - it's craven blame-shifting.
Trump already has a blank check to issue pardons and already intends to abuse the power in ways never before seen, and it doesn't make the slightest bit of difference what Biden or anyone else does or doesn't do.