The advice is good in general, but how exactly will it help in this specific case? For example, how reliably does reading "cold-blooded rational" texts reduce anxiety? It could easily have the opposite effect. Like: "Oh, to be successful with girls you have to be like this, and I can't imagine myself being like that... so I guess I have no chance." There; anxiety doubled. Now not only does one fear about rejection, but also that without developing the proper (possibly unsympathetic) personality, even the short-term successes are ultimately doomed.

Also, I wouldn't call all pickup materials "rational". There is a market out there, and there are people trying to make money by selling books. The books don't sell better by being more rational, but they can sell better by exaggerating claims, or adding new speculations only to be more interesting.

Even if some recommended method works, it does not mean the explanation behind it is correct. Maybe it's just a placebo effect. Thinking that one knows the seduction method increases one's confidence, and confidence makes one attractive, ceteris paribus. Even if the method itself is neutral, or even slightly harmful.

It would be probably more useful to recommend a specific material. (For example I would recommend "The Blueprint Decoded", but I wouldn't call it rational.)