"The dollar is the reserve currency of most of the world because of the explicit threat of violence. This isn't hyperbole, this is reality."
This is mostly a conspiracy theory.
And this: "It's simple. You take the loan in dollars, then pay us back in goods, sold at a discount in dollars. If you don't, we sanction and embargo you. "
Is essentially not true in any broad sense.
Also, there is no such thing as a 'world reserve currency'.
The US does use some leverage to require that Oil is traded in USD, particularly with Saudi Arabia, but that's the price of effectively keeping that nation relatively stable, which is not unreasonable.
Outside of Oil, there's really no reason for any nation to transact in USD or to keep reserves other than for what makes sense to them.
Oil is a key issue in the equation, but it's not actually essential.
The USD is mostly a reserve currency because of the size, openness, and relatively integrity of the US system.
The Euro is definitely a 'reserve currency' along with UK pound, but proportionally so.
The RMB isn't really a reserve currency because of lack of transparency in China, that said, the sheer power of China means that nations that trade with it will adopt it as a reserve on some level.
Cryptos unfortunately don't really solve the problems in this geopolitical equation.
But someday, they may help to.