Well they invite the "best" dunkers that are around, Romanian in origin. Then they invite special guests like world renown dunkers (Guy, Golden Child, Ziani etc). So since Nightfly is a good dunker he got in. We meet with the organizers of the competition ... I wrote some articles for them for free... just to promote the event... and so on.
And yeah Golden Child is crazy. But they all look "genetic"... (although it's hard to put a finger on what they have as superior to us) - they're all smooth and efficient, and not necessarily strong (at least in the traditional way).