No.
Dumping 200k BTC = one API call.
Clearing the book, placing new orders and moving alot of orders in HFT style = ALOT of API calls.
And since you don't want other people to place orders while you're doing, you have to be fast, really fast.
The http API is slightly faster in accepting orders, so I guess it fired a huge batch of orders in like a second, causing a DDOS of the gox webserver.
Maybe the DDOS wasn't an accident at all since it prevents "normal" traders from using the web interface.
Normal traders using the web interface already cannot compete with api clients... what's the point?
Why enforce what is naturally so?
I think an internal fuck up is more likely than DDOS in today's case.
If it was a DDOS, it worked out but didn't seem so advantageous today. Still, it might be a try out for a future bigger similar play..