definitely they are NOT hacked.
they dont have customer's deposits. that's why they are closed.
my guess is they lost them on margin trading or dodgy trading of some sort. Either way, once the tide goes out, they can't pay so they invent a "hack".
It has been quite clear Bitfinex is a massive fraud from the beginning. Anyone who didn't believe that is now finding out the truth.
TLDR;
No hack. Just fraud. Either way, if you are a customer, your money is gone.