They don't care about the market situation and are interested in bitcoin like we think, they are selling and want to sell at a better price.
I think you have a valid point, they just want to sell their Bitcoin at good rates and for that they have bought some Bitcoin back to let the investors know that they aren't dumping their 50k Bitcoin at market.
However, they're still interested in converting their Bitcoin to fiat and that's why they're doing it in a way where they're getting some good values for their Bitcoin.
I'm pretty sure that they're targeting $55k per Bitcoin rate and for that they'll slowly dump their holdings from time to time and wait for market recovery after those dumps and then dump it again.
Regardless of their intentions, after several days of market panic, we are witnessing a market recovery. If you check bitcoin prices today you will notice that the market no longer seems to care about what the German government nor Mt.gox is doing, bitcoin is once again approaching the $60k region.
Personally, I even hope they sell all the bitcoin they have because in the long run it's good for us, because we will no longer be manipulated by them. Also, congratulations to those who had the courage to buy bitcoin during the past few days of panic.