Though it may remain unanswered, the question arises as to why the 13 BTC is untouched for this length of time. If this was an all-out exit scam things would have been far more obvious but they have not moved any funds. If I had to choose between exit scam or them being unable to access their server, I would come to the conclusion they no longer are able to access their server.
Perhaps they are in no rush to spend the Bitcoins, as they have more Bitcoins stacked somewhere? They would most likely get back to spending it once the dust has settled down.
I have seen that kind of behavior before, with scammers and hackers. They are definitely aware that the address is being closely watched.