Please stop double posting...you could also wait for a few answers before changing the subject repeatedly. Use the Edit button and either copy and paste the quotes or just press the multi-quote buttons; they're located next to the Edit button.
Basically, they either want someone with a mechanical engineering degree with many years experience in research and development, or a retired professional racing driver that can offer input and is aware of slight or even infinitesimal changes to the car.
Most real-world testing is not done at 150mph; instead much of the testing might be over an extremely bumpy road at 35mph for 500 miles, through large puddles of water, and/or in unbearably hot, desert conditions without any working air conditioning. Throw in some icy conditions, 256 miles of driving with the parking brake engaged, another 142 miles uphill with varying loads strapped to it, 378 miles in 2nd gear, and repeat the process over and over again, noting the changes and typing all up with graphs and an equally boring Powerpoint presentation.
Then repeat the entire process because they switched the exact location of the battery compartment in the engine bay, because the unions refuse to allow their drones to install it on the passenger side of any car with a model name ending in the letter "y", due to the contracts.