It looks like it did sell higher than the market which makes sense because the price would have gone up a lot while they bought so many coins from the market.
There are no facts to support that its sold above the market price, only rumors.
With the same logic one might say that they were sold under market price because the dump of 50k BTC would bring the price down.
Anyways, the price is fighting to rise again @okcoin and btcchina
cheers