the thing is, their announcement was enough for such manipulation to take place
what manipulation do you think took place, exactly?
It went up ~5% in a matter of minutes, what would you call it if not manipulation? I didn't say that Bitfinex managed to manipulate the markets but it was a good short term shake for the short-ers to get a shock with a candle almost red during the beginning of the day but suddenly stroked up in no time.