I would expect a botanist to know that a tomato is technically a berry, just like I would expect an economist to know that inflation is technically defined as an increase in the money supply.
Everyday people can use whatever definition they want. That doesn't mean economists, the Fed, etc should say "inflation" when they mean "price of goods".
Do you have a source? I've only ever seen it defined the traditional way. Besides, you can increase the money supply and not get inflation (defined the usual way). Inflation happens when the money supply increases more than the economy needs.
Inflation happens when money supply increases more than the value of the goods that you can purchase with that money supply. It isn't about needs, but things that can be bought, especially those with limited supplies like housing.
That definition depends on where you look, and when the definition was written. Between the roman empire and the mid 1900s inflation always referred to an increase in the money supply.
Everyday people can use whatever definition they want. That doesn't mean economists, the Fed, etc should say "inflation" when they mean "price of goods".