Shut down being used to install 5G in the schools???
Non sequitur.
The maker of the video called the number on the van. He asked if the crew was cleaning. "No." He asked if the work had anything to do with 5G. Click!
Yes, exactly.
https://www.naminc.com/services/
Services
NAMI provides a full array of mechanical services to exceed our customer’s needs. Our mechanical services include:
. HVAC
. Plumbing
. Process Piping
. Building Controls & Automation
. Building Security
. Service & Maintenance
Cleaning would fit that last category, but the woman on the phone said it wasn't that.