...and as the gates change the changes are reflected on screens displayed throughout the airport; it's not like the correct gate information is only stored in the minds of the employees working that day
If you suggesting or thinking the screens are somewhat connected or talk with the same system that the gate scanners are running on, then that's incorrect. Totally separate rail.
AFAIK, the scanner only checks "okay this is the airport you supposed to be inside within 48hours timeframe". That's all.