If MDMA is neurotoxic like most believe that it is, he wouldn't have had serotonin receptors left after that kind of abuse.
It makes for a good story and I've seen people on several forums getting a kick out of it, but quite honestly I'm not convinced it's true. Another one of those "reefer madness" stories. Y'know, look at this guy who was so into drugs and how fucked up it made him, so all of you stay away....
Although, considering how much he allegedly took, he's really not all THAT fucked up now.