Did Satoshi coin the term cryptocurrency?
Satoshi certainly used the term, but I don't think it's definitely known who first coined it. I did read this thread recently:
Who coined the word "cryptocurrency" ...Bitcoin is not "property". It is definitely a form of money or currency for purchasing goods and services.
I agree with you, but again, that's irrelevant unfortunately. What we consider bitcoin to be, even if we are actively using it as a currency (which I do almost daily), doesn't matter when it comes to taxation. If your country's tax authority class it as a property or asset, then they will tax it as such.