The author acknowledged that the method isn't perfect in the article:
"This approach isn’t going to be perfect — unless you were willing to spend literally hundreds of thousands of dollars on a scientific survey of college football fans, you’re going to have to resort to some educated guesses."
It is a non-conventional way of getting this information, but it is still an interesting result.
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Here is an article I found about it. It also has a link to a video showing him jet pack across a 1500 ft gorge
Link
The author acknowledged that the method isn't perfect in the article:
"This approach isn’t going to be perfect — unless you were willing to spend literally hundreds of thousands of dollars on a scientific survey of college football fans, you’re going to have to resort to some educated guesses."
It is a non-conventional way of getting this information, but it is still an interesting result.