I don't think you can dismiss Flynn, Davis, Burbage or Liberson on the grounds that the F-35 had already been "sold".
For clarification, I've not dismissed anything those guys have said. The accusation was that the F-35 program
was sold on lies by LM. The "proof" that was provided was flawed in two ways:
1. It post dated the "selling" of the program by more than a decade.
2. None of their performance claims have been shown to be wrong, much less lies.
The program has 30 international orders under contract. Of the eight partner nations, one has reopened a competition, another is contemplating doing so and at least two may buy many fewer than the originally planned numbers. So it continues to be important to sell the program.
May I point out that I indicated that Flynn likely made those statements to counter the vast numbers of false claims made that the F-35 kinematics are "abysmal". Refuting false information is part and parcel to any "keep sold" effort.