Watching that is amazing!
The Harvest Fest in Luchenbach has these trial riders and it's fabulous to see!
I did notice the tires on his bike are way under inflated, I'm assuming for better stability.
Years ago at one of our events here in my 2-horse town they advertised a "Wheelie Rider" to WOW the crowd and he was impressive ( nothing like this Toni Bou) and his tires were flat too.
Back in my day there was this guy below, (Doug Domokus.sp) and it looks like he was on a regular Enduro bike...
https://www.youtube.com/watch?v=IEAT74rKJM0