That's the total amount the address has ever been exposed to, ever. As you scroll down you'll see red arrows and green arrows, along with dates. Red = withdraws from the address, and green = deposits into the address. You can see the dates and note this is just an address that's been doing business(whatever that is) for awhile now. You see the pagination at the bottom and can view history for at least a year back.
In short, this isn't news. It's people who are angry looking for a target. Don't let this be a repeat of SheepMarketPlace fiasco... http://www.theguardian.com/technology/2013/dec/09/recovering...
You can't catch bitcoin thieves this way. They need to make some other mistake somewhere else outside of blockchain world.