From TFA:

> The Paperwork Reduction Act (PRA), which is set law, provides a “complete defense” against any penalty for failing to respond to any collection of information by a Federal agency that hasn’t been approved by the Office of Management and Budget (OMB), isn’t accompanied by a valid PRA notice, or doesn’t display a valid OMB Control Number.

As the article works through, as a Federal Agency the TSA cannot just label stuff "screening" and demand money, or at least, they can't do so and then make you pay it.