The response largely misses the NSA video's point: If you think you're a good fit for the NSA, the polygraph shouldn't stop you from applying for a job.
It's crap science, but the NSA can erect whatever arbitrary hoops it wants for employees. Any fool watching the NSA video for insight into other uses of polygraphs does so at great peril. The response is most informative when he says, "This is true of NSA employment practice, but . . ." Seriously, someone with a principled objection to the NSA polygraphing prospective employees, is going to have a real eye-opener on his first day of work there.
Accusing the NSA of intellectual dishonesty is as useful as accusing water of being wet. Polygraphic prospective hires doesn't have to catch anybody to serve a purpose. It's enough to drive the pissant commie sympathizers to bother someone else. Or maybe not.