As Oztrich Boy pointed out, Dr Kurt E Koch was an easily deluded dupe who should be ignored. Fooled by kids with drawings on stick, not an authority on pretty much anything.
To be accurate is was Gardner and Doyle who were fooled. It is doubtful if Koch paid enough attention to the actual photographs to be "fooled"
His book is a grab bag of "Examples" demonstrating the world is full of demons and the occult. Deep analysis is not his forte. Just a laundry list of 388 numbered "examples"
Although his take on Doyle is not one of the numbered ones
Arthur Conan Doyle, author of the Sherlock Holmes stories, was a spiritualist. He published reports about nature spirits and the people who had seem them Conan Doyle also posesses negatives of nature spiritsAn interesting phrasing, it circles misleadingly around Doyle's articles about the Cottingly Fairies without giving any real information, while never being false within the meaning of the Act.