I have seen officers making notes of how the tires are aligned so they know whether the car has been moved when they come by a second time. (Seen in DACH countries)

What's to say you didn't leave and return and your wheels are in roughly the same configuration?

Ah, so, the honor system.

Not quite - if you try to game the system by post dating your arrival time, and the disc is checked quickly enough, the enforcer will see the disc time is ahead of the current time = ticket.

but you could come back after an hour and update the time

and you can wipe chalk off your tires after an hour, too.