Could be that Tesla doesn't pay J D Powers to do surveys. It's an open secret that J D Powers will figure out a Survey that makes you come out on top if you pay them to. It's then obvious that anybody who doesn't pay them ends up ranking lower.
That takes something that may well be true, and extrapolates, with no factual basis, to something that very likely is not true. If peoples' experiences weren't jibing with the JD Power survey that would be one thing. To say that the terrible build quality of new Teslas is just normal and is being exaggerated despite all of these BGN* Teslas showing up, that is choosing wishful thinking over reality.
* Buick Grand National. The car, which used a turbocharged V-6 that made it a wee bit faster than the Corvette of the same year, was known for terrible build quality, with the doors literally falling off of some of them. If you bought a BGN, it was advised to get your wrenches out and re-torque as many bolts as you could possibly reach, then cross your fingers about the ones you couldn't.