The author also complained that his book was "erased". He could not be more wrong. His book has an ISBN, so it is part of the Library of Congress -- the permanent library of America.
Complaining that a book no is longer being sold by Amazon for being "Anti-Trans" is like complaining that Timmy's stopped selling decaf because it is an "Anti-Caff" product; especially when decaf products are sold all over Canada at many other stores. He can find his book for sale at many places other than Amazon.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.