I think the assumption for the video was that the ammo companies could stockpile and reduce the supply and because of rising demand prices would stay high. That's why diamonds are so expensive despite the fact that they are not rare.Ammo companies don't make money stockpiling, but .gov agencies and distributors buy and can stockpile.
What the pandemic taught use is when .gov causes a panic and forces an economy to shut down demand skyrockets.If the plandemic taught us anything it's that ammo companies do not feel beholden to the 2A community.