I am not aware of any mechanism for account suspension on the Steem blockchain but maybe the devs have some sort of method. I don't believe the account was actually suspended to be honest.
I think the hacker just made it appear that way so as to give the impression that the user was being penalized for their poor security practice as a smokescreen for what the hacker was really doing which is to buy time so he could power down.
That's what I believe happened and let, if so, glad it didn't work out. Nevertheless, it is a good thing, in a sense, as now security awareness is in the forefront of many a Steemians minds.