It's possible this was just coincidence.
1. The NIT closely follows geography:
The #1 seeds were Syracuse, Cal, Iowa, Illinois St.
The #8 seeds were Greensboro, UC Irvine, South Dakota, Cal St Bakersfield
So if those are the true #1 and #8 seeds the matchup has to be Syracuse-Greensboro. Nothing else makes sense
2. Could they have played around with the seeding? Inconclusive.
Could Greesnboro have been a #7 seed? The 7 seeds were Belmont, Valparaiso, Oakland, Akron. Belmont, Valpo, and Akron are all clearly better in the metrics. So it comes down to Oakland. UNCG has the better RPI, Oakland had the better metrics and more top 100 wins. So it's possible they switched the two, but just as likely that Oakland was the better team.
Could someone else in the south have been a #1 seed? Could Clemson or Georgia have been the #1 seed over Cal or Iowa. Once again possible, but not sure.