Who was Mathieu Paoli?

I have been working on a bibliography for the various books mentioned in the footnotes of The Widow's Son, which I'll publish here as soon as I can finish it. For the most part, this is a straightforward exercise — if I suspect a book really existed (Wilson includes some made-up books) I can find it on Amazon, Abebooks, etc. But I have been struggling a bit with Les Dessous D'une Ambition Politique, allegedly by one Mathieu Paoli, a Swiss journalist reportedly executed by the Israelis as a spy in the 1970s. He is mentioned in this interview, and there is information about him in Holy Blood, Holy Grail, but it seems odd there is not more information about him. I also would feel better if this entry didn't say, "fake entry, this book doesn't exist." Can anyone help?