Certified Jaguar technician — what’s that?

Hello, can someone tell me what a “certified Jaguar technician” is and on what basis this certification is awarded? === I had contacted the customer service twice by phone and at [email protected], but their answer leaves the question open. Also the question whether the LIN bus is part of this certification would not be answered. Jaguar states that “comprehensive expertise” and in the “own academy” would mediate:https:/ /www.jaguar.de/…/techniker.html However, the reality was then that a car dealership advertises practically without interruption with its certifications – but then the technician “measured” the LIN bus with the DMM. And the boss of the car dealership praised that too. How to drive the LIN bus obviously did not know either. In particular, I wonder why there are oscilloscopes with special LIN and CAN bus decoders, if this technology is just a certified technician in an official n Jaguar car dealership is completely foreign. Greetings, Alexander