Ezine Articles is garbage, too. I've run into them before. They're a content farm where people post junk articles to clog up search engines to drive traffic away from real articles.
I have done a lot of research on adults with Asperger's Syndrome. All I can say is there's not much to say. Almost all research is concentrated on children, teens, and young adults. Once you get past college age, there's almost zero information out there. One thing I hate about psychology research is almost all the information is locked behind paywalls on the Internet, so there very well could be studies on life expectancy that are not available to the general public. If so, these have not filtered down into any of the books I have been able to find. Because AS is so new, I don't expect much information has been gathered about cause of death. Besides, most people over 30 with AS are probably undiagnosed, so even if there were stats like this, they'd be questionable.
Given the nature of Asperger's Syndrome, since it doesn't have anything in particular to do with the body's basic physiology, any decrease in life expectancy would be from other complications, like suicide or sensory perception issues that cause an early fatality (perhaps such as operating some kind of machinery). Since NTs can combine recklessness with stupidity and achieve the same sort of bad outcomes, I would not expect the life expectancy of AS to be significantly different from the overall population. If anything, I would imagine people with AS to be safer since they probably wouldn't engage in reckless behavior like drinking and driving, and tend to follow rules scrupulously like safety guidelines.