What type of connectors are used on the Elite Core stage snakes? Are they real Neutriks?

Yes, they're real Neutrik connectors. They are the series that Neutrik brands as "Yongsheng" or "NYS" or "YS" and they are made in the Neutrik factory in Ningbo, China. You can see more about Neutrik's worldwide offices at this link: http://www.neutrik.com/en/neutrik-group.