It's good they point out being an official is a good way to make some money. This will help some of the thinning ranks in some of the sports.
No surprise that coaching earns more than officiating. I look back to when I was coaching, and remember that my pay on a monthly basis during the season beat what I earned officiating. Of course, what they probably did for the article was take some averages, and you know what HS football coaches earn in Texas now.