I'm certainly the LAST person on the planet who would defend the actions of a service center.... But in this limited case I think that the error could have happened anywhere. They didn't rotate your tires because they cared about the tire life. When working on the alignment they likely had to remove all four wheels to get access to the adjustments (b/c Tesla's are annoying) and the tires would have been off to the side and possibly stacked up. So they didn't chalk them to know which was which, and they just got grabbed in the wrong order going back.
It IS a brain fart that they didn't look at the tread pattern or the label on the sidewall that would have indicated the rotation, that's the service center's usual level of dumbassery of missing obvious things.