If somebody is hoarding half the global food supply it wouldn’t just cause inflation. It would crash the market, shelves would be empty globally. Thus the fact that shelves are NOT empty globally tells us the story is a LIE.
You underestimate the flexibility of a global market. The global food supply is huge, and a shortage of this sort is not felt as much in the first world, where it’s just part of the inflation we’re all experiencing, as it is in the third. There people are starving, but there are no TV cameras, so the world ignores it.