I am pretty sure this is FUD, however in the event it is not there is a very reasonable explanation for this. If you want to short any kind of security, you need to be able to borrow it first, if there is none of the security to borrow then you cannot short it. In other words if there is no BTC available to borrow then you cannot short it
People have funds on the line when they trade. If something is awry, what am I supposed to do, bite my tongue. In a nutshell, piss off with the accusations. I swear, some people on here just want people to get screwed over.
And Bitcoin is great and even Bitfinex is fine... but there was an issue so I said something about it.
/thread.