I'm not going to watch this to see if he boiled his poop or not, but even "clean" looking water can have microbes causing diarrhea and dysentery, which in a "survival situation" would lead to death.
Bear Grylls is really just a very dedicated troll. He gets off on knowing that at least one person who gets lost in the African savannah will end up drinking elephant shit.
I'd have died from trying to get water by chewing the wrong kind of plant, or from drinking the plasma from separated animal blood LONG before I would have been willing to try drinking elephant poop water. Not all of us have the luxury of being stranded in the wild with a camera crew and a medically-trained safety team.
While there are plenty of people out there who enjoy eating shit and drinking piss, Bear Grylls is perhaps the only one who managed to convince a major cable network to fund an entire show based around his fetishes. The rock climbing and other nonsense is just a smoke screen to pass it off as a "survival" show to the producers and investors.