You really think that donating 75 million dollars grants you to any ToT?
Hey, maybe they'll get a sticker on the plane.
Well it is interesting they are letting people get really close to the plane, which is a first and could explain why they chose to send a prototype over a serial aircraft, besides all the other reasons mentioned.
I don't think people will be getting this close to a J-20, for example
The J-35A is noticeably "slimmer" than the F-35
The J-35A isn't saddled with the requirements of commonality with a VTOL variant which means even if slimmer, it probably has a similar weapons bay, if not bigger, as it doesn't need to be split in half and wrap around the massive engine like that of the F-35 does.