It isn't the waitstaff's only job to serve you. They're also interpreters that can skillfully translate a wide variety of awkward-speak.
You might have missed it because of that distracting rectangle, but the receipt is filled with delightful examples of a cashier whose power has gone to his head. His Holiness indeed.
Death by getting your skull split open with a giant ballpoint pen. The pen is mightier etc. etc.
I guess the horrible interference wasn't the crappy intercom system's fault this time.