If you don't comply you can be fined, see section C of:
http://www.tsa.gov/assets/pdf/Sanction_Guidance_for_Individu...
(refusing to be searched violates a number of those provisions which adds up to $10k)
And you're not allowed to record in TSA sterile areas, there are signs at airports that say so.
I'm not saying I agree with the law (note I wrote 'good' case above), but your point that the TSA website says otherwise isn't true, and it's a shame I've been downvoted for it. Perhaps you'd like to edit your comment with the url on tsa.gov you are referring to?
The whole point of what I was saying, which you missed, is that if the TSA wants to make this case into an example case to set a hard line against those who don't want to do back-scatter, those videos are going to be damaging to him.
http://www.san.org/documents/corp_serv/Codes/Article%207/Cod...
I'm not aware of any major airport that lets you film secure areas, which is the point I'm trying to make - and so that could just get rolled up into a civil case against him. Which is the point I'm making.