There's no way for the pax to confirm for himself that there is no misinformation if he's not allowed to review the report. And "possible yes, probable no" is exactly my point: it is possible that TSA will make a mistake and go after this guy for "trying to carry explosives onto plane," and he can't find out for sure unless he's allowed to review the report.

TSA has moved to exempt some aspects of itself from the PA (e.g., employee schedules and such, which makes some sense) but the whole agency can't exempt itself from the PA. TSA has in fact tried to exempt much of its passenger dossier system from the PA. Some of the reading in the exemption request is quite comical. It says things like (paraphrasing) "exempt information about passengers carrying prohibited items so that they cannot find out that they are being investigated or that they are going to be punished." It's a total attempt to circumvent due process by conducting secret investigations on innocent passengers and doling out punishments with no real means of recourse. Real law-enforcement agencies could never get away with hiding evidence from a defendant, and I hope these TSA antics get shot down with great disdain some day by a court of law.