Well I did try to caveat it that its one of the few sources I could even find that reference the fact that the definition was changed.

My argument isn't with the fact that "inflation" is in fact being used to mean "price increase of goods." My issue is that economists co-opted the word at all and made it functionally useless, especially in isolation as it is often mentioned with no other context of why prices changed.

The use of "inflation" to mean money supply increase goes all the way back to the roman empire.