He either withdrew via International wire (not SEPA) or he had another withdrawal complete successfully for the last 20 days. Last time I heard MtGox were processing SEPA withdrawals initiated at 2013-12-30. The reasons for the delays (SEPA and JPY) have been fully explained here many times, but please don't let it stop you from inventing your own. It tricks weak souls into overbidding, making arbitrage very profitable.
I'm just report fatcts their payment time increased or they stoped it.
Of course you report facts, but you are omitting important facts as well. Please read my answer again for the explanation of the delay.
How they get their own liquidity in their one direction market ? If most of the people imputs btc and withdraw fiat, how can they sustain this for long therm, were they get the money to pay arbitrage profit ?
Deposits of course. Every time you sell, you sell to someone who deposited money at some time. (Or from someone who sold BTC to someone who deposited BTC at some time, etc, for many iterations.)
If any one can answer that maybe the understandable speculation will decrease !
This is how every exchange with an order book works.