>>/115693/
Sorry, this is BS.
NG has no authority, or control.
It is FAA.
The only real thing that happened was an issue with ERAM at Miami, so the FAA slowed inbound traffic to FL.

https://wsvn.com/news/local/miami-dade/hours-long-florida-flight-delays-caused-by-faa-air-traffic-control-issue/