Where in the text does it say that it is necessarily Napoléon who is buried in the Invalids?
This can be found in the two last paragraphs on the 5th page. The point is that there was no opportunity for such a hoax. I in fact asked Ben Weider about the issue in August, 2007. I asked if there was any sensible reason to think it is not Napoléon I Bonaparte who is buried in the Invalids. He answered in a noticeably angry tone that no serious Napoléonic researcher believes anything such. (Yes, he really used the word believe.) I answered that if he felt insulted I was sorry for that.