If you are pulled over for speeding, until the officer lets you go, you are detained.

So not only was he detained but his bag was seized. Now arguably everyone is briefly detained by the TSA on condition of travel, and arguably all bags are seized briefly. However, that is why there needs to be scrutiny on these practices.

ALL of what the TSA does is theater, and it actively makes us LESS safe. Their actions cause over a thousand unnecessary deaths a year by making air travel less convenient and more expensive so people who drive when they would otherwise fly get killed in auto accidents. There is no evidence they have saved even a single life with any of these precautions, much less the thousand-a-year they'd need for the billions we spend on them to be a break-even proposition.