Yeah my point was there is no one, absolutely no one, to authorise a Classic Amiga repair shop. You want to set it up you can, but if you want an authorised Amiga repair shop you are about a decade and a half late.
The flip side is that there's no one to "unauthorise" one either. If you find one of the many that went out of business, you could buy their authorisation....
But the Classic Amiga world is small enough that it really relies on reputation more than anything.