Bunch of namedroppers who've taken a few too many rips off the four-foot Grafix, it looks like. Really, what the fuck? DFA has been maligning slacklining for years, and this is really emblematic of all that is malignable about this pseudosport.
The worst thing about it is that this is making the Doctor sound like that curmudgeon Dwayner and his sinister sidekick The Pope in the throes of one of their anti-sports climbing fits. Heinous!