"The entire industry of pick up technology is based on the premise that there may be a technique that can successfully attract a woman."

As far as I understood, the real point was not there is some magic bullet that can attract any particular woman a man desires.

Instead it was about finding some subset of female population upon which some of these tricks do work.

It's kind of refined Feynman's strategy - keep trying whatever shtick you have on different women till you find some on which it works.

That is why these people can report some successes - if just you want to attract some woman, it's much easier than wanting to attract that woman.