In fairness (as stated previously), it would indeed have been preferable to have had access to the original testimonies and/or documents on which Allen based his logbook notes. As matters stand, the explosive content of Allen’s logbook, without some kind of corroboration, amounts to little more than hearsay. The story may well be true, but without something to authenticate it, it is destined to simply be ignored by mainstream Egyptology. In the words of Lawton and Ogilvie-Herald, this particular piece of evidence will be regarded as “inadmissible”
until it is somehow corroborated.- HOAX p.78-79
And HOAX then goes on to present an analysis of Allen's logbook account to try and provide some corroborative evidence to substantiate the account and, all things considered, imo the content of that logbook came from people who understood the world as it was in 1837; that Allen did indeed meet his elderly relatives in 1954 and that they did pass on this account of his ancestor's time with Vyse at the Giza pyramids to him. I see no reason to think why Walter Allen's relatives would have set out to deceive him.