It's not a defect .....it does happen when you use enough pressure on any tablet. Go try it on an older iPad , Samsung tablet , HTC, Motorola or whoever else. Take these "evidence" threads with a grain of salt. While yes some might have an issue people want to take it to the extreme . Under normal use conditions which involves a slight push down of your finger on the screen this does NOT happen at all. My Samsung galaxy tab s 10.5 I could do it if I pushed hard enough but I can't with normal use. There's no need for video
Of course its a defect.
Any other iPad exhibit this issue? NO.
Any threads about this prior to the Air 2? None that I have seen.