The buyer is not totally correct!
My understanding is some propellants are made in the USA, Canada, Australia, and in Europe. They are experiencing raw material shortages as well as all the rest of us are along with covid worker restrictions. They also have contracts with military users and large manufacturers they have to supply first. Reloaders and our canister propellants are a small pprtion of their production and we have to wait our turn sadly.
It is the same thing with primers. They make them for finished ammo before releasing them for reloaders.