Travis there are a ton of people that speed fly that are also kiters, My self and several others have tried speed flying and it is a bit to spendy for me, but there are a group of devoted flyers, the video you posted has Tommy Renyolds and Trevor Morrell, and Marshall Miller, thoose cats are all kiters this is trevors first year flying, but Tommy and Marshall helped pioneer the sport in the US five+ years ago.
On a side note, slash relality check, No one in Utah is setting records or pushing new ground gliding, with kites. There has been a hard core group or euros flying over a thousand feet high, on 4 minute plus flights with kite gear for years, no one in utah is even coming close, to that, and any gliding that goes on at skyline is off the begginer hill, and will never come close to what can be achived at other spots around the state. We do have a talented group of kiters who fly well, but what you see on our local forum is nothing compared to the current level of flight with kites world wide.
Here is some locals at skyline for the snowkite masters, I just dsaw this on kiteforum.com
http://www.kiteforum.com/viewtopic.php?f=6&t=2369953