Well first of all, I wouldn't compare Peyton to an 'average' EB time -- I'd compare him with the fastest. Some numbers for you: this year's fastest elapsed time was a tad over 7 hours, at an average speed of ~11.5 mph. Peyton's elapsed time was over 17 hours, with an average speed of 10.5 mph, so quite comparable in my view.
Not of course, that you are implying something is up with his posted Strava track ...