Well, the message is real, and I don’t think the pilot was joking.
https://live.acarsdrama.com/@acarsdrama/116708457056507627
During non-testing hours or weekends, manned flights may sometimes be cleared through, but usually only at extreme altitudes (24,000 feet or higher) and only after being coordinated through local ATC and range control.









Pretty much all I know is off of this thread:
https://live.acarsdrama.com/@acarsdrama/116708457056507627