The person in the video you linked to says Bitcoins aren't useful because you can't do anything but trade them and because of this they're not valuable.  Hard to imagine a real "Austrian Economist" making such a comment. 

Every major currency used in the world has this same feature - being useless beyond its ability to facilitate trade. The ability to facilitate trade in and of itself is a valuable service.  Anyone who disagrees is more than welcome to send all of their bitcoin and fiat currency my way. 

He may be "Austrian" but an economist? No.