They are using Mijin as a private chain, not the public NEM blockchain.
It says NEM technology, because mijin is based on NEM technology. They should have made it clearer in the press release.

Nonetheless NEM will benefit from this directly because if Mijin is successful and gets more money, it can pay more developers, who will contribute to the core (Catapult) which is shared by Mijin and NEM, plus it gives NEM a lot of credibility and proves that it's enterprise quality technology, which will help the entire NEM ecosystem immensely.

NEM becoming established as enterprise quality blockchain tech supporting biz solutions. http://ow.ly/6umJ301tLO1  http://www.nem.io/