If an artist creates a collection of 21 art pieces. It is announced up-front, each art piece is numbered. He sells one of them to first customer. Is it inflation of his art pieces when he sells is second piece? No, it's not. His art is in the hands of different people, and more and more other people as he sells more, but it doesn't change anything that his art changes hands.
All the Bitcoins are already "made", we just make them available. This is not inflation, even though it might look like it as it has some similar features. Calling it (what happens on Bitcoin) inflation, detracts from the evils of inflation.