Since when do you parachute (for sport) from a JET?
It is done. I have jumped a 727 (DB Cooper style) at sporting events, and in the military I jumped a variety of 'jets'.
As for this article, a Cessna 208B is a turboprop, a type of turbine engine but not a pure jet or even a turbo-fan like most commercial carriers.
And speed on jump run is typically about 90 mph, so calling that a 'speeding jet' is a bit of an exaggeration.
I agree the Caravan is a turboprop and not a jet but you did ask about jets ...
Since July 1992 in Quincy Illinois at the World FreeFall Convention (WFFC). A Boeing 727 with the rear airstair removed. A Jet was jumped '92,'93,'94,'95,'96. I think later conventions also but I "do not recall" jumping it past '96.
After DB Cooper and some military folks recreating his jump... I was 17th out the door on the first sport pass ever. I worked the WFFC as a load organizer for many years in the 90's :-) Not sure which day in my life was the best day ever but I can easily narrow it down as to where I was!!! :-)
According to the video it looked like his main canopy cutaway handle was dislodged also. It might have been his deployment handle not sure. If his cutaway HAD also been pulled it would have ended tragically/fatally. My main canopy cutaways are a pillow handle similar to what was highlited in the YT video, my reserve deployment handle is a metal handle similar to a caribiner.