http://www.youtube.com/watch?v=URA44bGJM-8It's Joe Eigo, a pretty world-renowned gymnast/street stuntman/pseudo-tricking kind of guy. He's very very skilled, a really amazing athlete, but not at anything in particular ... he likes to mix-and-match whatever he thinks is the most interesting or useful stuff from all disciplines.
Unfortunately, from a very recent conversation with one of the guys who trains with him, apparently he and his crew have the names "parkour" and "freerunning" exactly backwards ... the guy (who is a really good athlete himself, and a great person, and not to be disrespected, just that he's misinformed) told me that it's one of his pet peeves when people get it "wrong" ...
This friend and training partner of Joe's said:
I've always liked to think of parkour as the acrobatic "tricks" on a concrete playground not necessarily the most efficient, but the most fun and flashy whereas free running is the quickest, most efficient way from point a to point b - not so much with the acrobatics.

So, this might have actually been a "deliberate" misuse of the word parkour, in that Joe Eigo might have actually told them to say it that way, without realizing that he had parkour and freerunning mixed up.