I don’t think it’s AI. Looks like the mail truck is simply parked next to an auto shop and caught a reflection in its window.
If this is AI generated then it’s remarkably good. The reflection is clearly legible even while mirrored:
Front End Specialist
Air Conditioning
Electrical Service
Radiator water pumps
And the red pickup’s badge says “Chevrolet Apache,” which is correct.
Schmutz.
It’s Yiddish (?) and is a general term for unspecified dirt or filth. The fun part: once you have identified the filth, it is no longer schmutz.
My spouse and I picked it up from the Says You radio show years ago, and have used it ever since.