I watched the video.
Glad to know the 5-11 is not accuate.
Also worth noting is that he wasn't kidnapped in a response to the "outrage" over the prison abuse scandal. He was kidnapped for being a Westerner/American/Jew; this probably factored more into his death than the prison story.
I will say that the prison story gave them a motive to kill him "now" rather than hold onto him longer. That plus another hostage had already escaped.