Slade's claims are disputed by the historians of the French organization "Les Indépendants du Premier Siècle", who argue that the various actors in question are not Natan and that accusations at Natan's trial and in Paris-Match connecting him to the adult film industry were false. "Natan", a 2013 documentary film, compares stills from the adult films attributed to Natan with official headshots and shows that several pornographic actors have been mistaken for Natan but are not him. Joseph Slade now admits there is room for doubt over whether Natan worked in pornography at any time after 1910.