I'm thinking in practical terms, not from the ivory tower of scientists. The refutation may lie in various scientific archives but is quite unlikely to ever be discovered by the people who read Blake's books. As our forum members are doing, these readers were/are looking primarily for help with their golf swing so the depth of theory presentation in the books, accuracy notwithstanding, was about right for its audience.
Earlier, you mentioned the lack of a golf scientist on the discussion panel. Presumably, the magazine organizing the discussion should be faulted for this. Jacobs and Adwick, well known golf professionals, were unable to refute the pressure idea. The discussion might have taken some different turns had they included one, though perhaps golf scientists wouldn't have considered such discussion worthy of their time.