I assume the Op, being a programmer and not a car mechanic, just assumed they mean the same thing.
The entire discussion here about how AI undercuts luxury brands has absolutely nothing to do with the actual post.
It would be somewhat odd to specialize in both American and European luxury cars. It'd be significantly less odd to service a RR and a BMW 3er next to each other.
A BMW owner has fussier standards (on average) than a Toyota owner. The 'higher touch' a service you're trying to provide, the less welcome these interventions will be. If there's a distinction between a normal-car garage and a luxury-car garage, this probably comes down to some sort of licensing or certification from those luxury brands. Seems plausible to me that luxury brand X could stipulate things like availability of human contact points.
Re: not being a car mechanic, it's true, but I'll have you know that I replaced my own blower motor a few months ago :)
This garage is for those older cars and has no connection to the actual manufacturers, so there is no licensing required.
I agree with you on the dealership dynamics though.
Jaguar-of-Theseus