Yes, it's most likely real.
Some users reported not being able to withdraw BTC from stamp today, others were able to withdraw (me, for example), and just a few minutes ago, user/hazek (of Bitstamp itself) posted this in the Bitstamp thread:
There are no general Bitcoin withdrawal issues presently. User's who are reporting that they are unable to withdraw Bitcoins will be notified individually via email.
We've discussed the whole thing on the wall thread for a while now, and I think the most likely scenario is that a few accounts were not necessarily compromised but at least *attempted* to be compromised, and they blocked withdrawal for those accounts until you tell them "Yeah, I'm good, my machine isn't compromised".
At least two users already said withdrawal worked again for them after they contacted stamp to tell them to re-enable withdrawals (one guy called them, instead of sending a mail).
Hope this shines some light on the situation.
