As you said, I checked the genesis TX and fond that the money had been transfer.
now there is 6300000 MLS in this addr: MUA9zphTUK1m2zg4riPRbWFGBni58bXBSe
where is the other coins,devs should open the information.
Interestingly, the coins have been moved after I have raised the question.
As now everybody can see the dev has been moving his premine to multiple addresses just recently:
It is possible to track down the coins and apparently they sit on 3 different addresses.