Ok, so he has two arguments for why it isn't a currency:
1) Value is too unstable
2) Processing is inconvenient
Response to 1) there are plenty of unstable currencies. They're still currencies. Instability is a negative, sure, but it isn't a disqualifier.
Response to 2) Bitcoins convenience lies in its obscurity, not in its processing time.
Note: I've never owned bitcoins and perhaps never will, but you can't just redefine what's a currency for a clickbait title. Currency = a widely used medium of exchange.