@icedquinn It wasn't even really "the UN" as I recall, it was just a claim put out by some bureaucrat. Musk publicly called him out on twitter (the bureaucrat also had an account), saying that if the bureaucrat could substantiate the claim with details for how whatever the amount was would actually solve it, Musk would immediately sell the amount of stock needed and provide the cash to fund it.
As you can guess, no detailed plan was ever provided. It was a laughably small amount relative to the scale of the world hunger problem as I recall, waaay less than the USA already provides in foreign aid every year.