Ridley is cherry-picking to an enormous extent, such that even if his statements are technically true they are without meaning.
Analysis of fibrous materials using X-ray crystallography did indeed contribute to the study of DNA structure, and the techniques may well have been used in the wool industry. However those studies themselves were dependent on earlier work, including the X-ray crystallography of crystals. There were also studies of and other inorganic materials, the theoretical development of X-ray crystallography, and the study of non-fibrous organic molecules (such as cholestrol, penicillin and vitamin B12), none of which area in any way related to the wool industry. These are in turn dependent on basic studies of refraction, such as the development of Bragg's Law. Use of X-rays in the textile industry was dependent on the basic science contributed by Scherrer, Herzog and Jancke. All of these contributed to the analysis of DNA, yet Ridley chooses not to mention them for reasons of his own.