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‘Plans for the Saturn V, Lunar Module and Lunar Rover have been destroyed and no longer exist.’
It is unsure as to why this claim is supposed to imply a hoax. If the hoax supporters mean that there is no complete set of blueprints in one place, then yes, this does not exist, nor has it ever. Millions of documents relating to the Saturn V and its components were spread out across the USA among several NASA centres and thousands of contractors. Certainly many original copies of these documents have been discarded, but still exist in other forms. Marshall Space Flight Center in Huntsville, Alabama had such documentation on microfilm and the Federal Archives in East Point, Georgia had 2,900 cubic feet of Saturn documents. These have since been scanned to a digital format and the micro-film destroyed but the information is still retained as shown below.
More details in the book.