VW doesn't bother sending a field rep out on a flagged car. I think this story has run it's course. I would need to see all of this drama in person to believe it.
Lets see:
1. Customer buys new car from dealership
2. Dealerships performance shop sells customer a tune, which voids the warranty, without informing customer (very illegal).
3. Turbo blows
4. Customer takes car to dealership.
5. Dealership scans tuned car and it gets flagged TD1
6. VWoA denies repair
7. Customer complains to dealership performance shop
8. Since the performance shop fucked up, they footed the bill for the repair
9. According to customer, performance shop paid the dealership to perform the repairs.
10. Because it is not a VWoA warranty repair, dealership doesn't have to use a new turbo, so they use one that has been sitting, likely taken off a car during a warranty turbo replacement (what I mean is they known put on a turbo that could possibly fail)
11. New turbo fails
12. Customer takes to dealerhship
13. Dealership contacts VWoA and finds out the history and issues with the car
14. VWoA gets concerned about the turbo failure. Even if they won't be covering it due to the TD1 and non-warranty repair, they are interested in why the turbo failed
15. They send out a Quality Control Technician to see why the turbo failed. If it was due to installation issues or what have you, then they don't care. But if it was something else, they still want to know.
It all makes sense to me, but I have far more experience in dealing with VWoA and dealerships than most at this point. I made sure that VWoA has been involved with my car from the start, and the QCT has been out to work on my car and inspect things 5 times already, soon to be a 6th. Mainly due to the windshield. I think VWoA is much more interested in a failed turbo, than a windshield.
I just don't see why OP would lie to us. Yes he hasn't exactly worded things correctly, but a lot of that has to do with his own confusion. VWoA and the dealerships like to be very confusing, and contradict each other, and even though they "just talked", still don't have any idea what's going on.