It's interesting.
I have mixed feelings. On one end of the spectrum, the mats never lie. His objective skill level is just his objective skill level and all the criticism he receives, regardless of how cruel, is real. I don't feel guilty for laughing.
At the same time though, who am I to say what jiujitsu is to him? Jiujitsu is really what you make of it and it has clearly changed this man's life for the best. Ironically, despite the criticism and ridicule jiujitsu truly benefits people, like the guy in the video, the most. It was really made for normal people to change their lives not for sport and not for MMA macho posturing or even the goofy inverted rolling heel hooks that I keep trying during live sparring. I'd imagine that people laugh at me when I blow a flying heel hook.... hmm....
If Rener belts him it's legit. That being said, I'm watching more videos for a laugh.