I don't trust this outcome one bit and suspect something very similar happened here. I'm guessing the Pentagon is getting very sensitive to the increasing volume of accusations that the F-35 is a trillion-dollar garbage fire, and wanted to do anything to try and save its reputation. This result seems very suspicious in light of the previous evidence that the F-35 loses to both current- and even previous-generation fighters. Not buying it.
EDIT: Thanks to jljljl for correcting my faulty memory about the book. I get my pop-sci insight porn confused sometimes :)