Did you read the article? At Vandy, with very little talent to work with....
"...he was a Broyles Award nominee in 2018 and has worked with 53 all-conference selections including the 2018 Lou Groza Award winner Andre Szmyt, 2023 Ray Guy Award finalist Matthew Hayball, and also two-time All-SEC long snapper Wesley Schelling."
The article goes on to give a full accounting of Vandy's special teams accomplishment while he was coaching there.
ST coaches are tough to hire because they all want to move on and up. So few have good resumes and still will take a ST position. More likely, you'll promote a position coach to STs. And, of course, they have no track record as STs coach. So getting a guy who excelled at Vandy with very little talent is about as good as you can do short up promoting an analyst.