In order for 50k scanners to perform 1 billion scans in a month, they need to be run nearly 24/7. It will require (in a 30 day month) an average of 129.6 seconds per scan, including both the 60 second scan time and moving people on and off the scanner surface. You get just over a minute to move someone off, clean the system, and get the next person onto the platform. If you neglect cleaning the system, and everyone is ready to go, then this is just barely possible if it's 100% reliable.
If they sat idle for 90% of the time, they wouldn't have enough time for the 60 second scan, let alone moving people on and off the platform. The math for their claimed target does not work.