Compare the question asked in the title of the study to the headline of the Runner's World article.
Title in Medicine & Science in Sports & Exercise
Do Older Females Store More Heat than Younger Females during Exercise in the Heat?
Headline in Runner's World
Are Older Women Runners at a Disadvantage in the Heat?
The study does not directly address the subject of "disadvantage." That is an editorial stance of the headline writer at Runner's World. Is it a useful study? I think so, if you stick to the actual conclusions made.