It wasn't just the developer statment:
http://87.230.14.1/nxt/nxt.cgi?action=2000&tra=536189619322400724
Every price drop happened this week after this guy sent 10M to the exchange. Today I watched it happen. Just after nxt arrived (I myself had incoming transaction, so I know when it got to the exchange), "someone" started to post lower and lower big sell orders, undercutting everyone, even himself. Also, at the same time "someone" bought up almost every sizeable buy order, down to 0.00000450. Even some small ones just for giggles.

This account sent around 40M to the exchange so far.