Author, thanks for the thread.
Before you uploaded pictures of your devices screen, I did so in this same forum, in this thread, with the survey:
https://www.mobileread.com/forums/showthread.php?t=77420 - folks say that this is a mechanical damage of the screen.
You had opinions from 3 different sources that this is the cracked screen, which is the case not covered by our warranty.
We may continue increasing the number of specialists that look at your device and all them will say the same thing - broken/cracked screen.
But, anyway, thank you for bringing this up - I'm sure, we'll get a number of positive feedbacks from those folks who also had our service and were extremely satisfied with it.