Maybe he is testing the new code.
on an exchange that is effectively live though? while his customers still have active orders, no less.
i think someone has just worked out how to access the exchange and is taking advantage of the glitch to inflate their balance. you can see that orders are regularly executed twice, giving double coins/EUR, which you can then trade the opposite way in multiple tiny orders and have many of those executed twice too. end result = free money essentially. i tried it briefly few hours ago and increased my EUR balance by 200 in about 5 mins... stopped straight away of course (and am ready/willing to hand the funds back)
trading engine is an absolute joke atm - this is why i didn't want to share how to get in