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In the crypto world inflation/ deflation refers to change in supply.

So it's another area where cryptocurrency enthusiasts just decided to change the meaning of some words? Like they did with fiat?

I don't think the words deflation/inflation are linked to money. A ball can deflate, which has nothing to do with the value of the ball or money.

I thought BTC had a hardcoded cap of 21M coins? How could its supply change?

If more than half of the nodes adopted an update with that cap changed, it would change. It'd probably result in a fork.

The 21M cap hasn't been reached yet so BTC are still being created.