Because he has obviously has a good arbitraging deal going. Would't you milk the cow for what is't worth if you have the change to do it?
How is reassuring people helping out his arbitrage opportunity? If people
weren't reassured, the price on Gox would probably be higher even, right?..
As he is in Norway he needs someone local with a Japanese bank account, so he has teamed up with someone and in lieu he puts in a good word as part of the deal.