Just about every photographic (emulsion) effect is one of adsorption. So, Crawley is somewhat off base with his comments quoted above. Adsorption has been a tool used for years. As for solvent developers, the results posted above show that solvent developers can work, and not too badly. OTOH, the surface iodide (and other adsorbed species that were patented in about 1970) were the things that did the trick and which also obviated the utility of the Crawley developers, and those of many others.
In other words, he said many of the right things for the wrong reasons and many wrong things for the right reasons!