Its alright, "best media-related overview" is pretty generous. A few things: A number of times the author alludes that this is only for young-athletic types, not anyone, so he/she looses the point of scalability. Next its stated
"The activity (and its name) were created by..."
which isn't the best understanding of the history of parkour, which is in fact part of our natural history and instinct. Those guys just crystallized the idea of it.
Then he/she just butchered the understanding of freerunning as follows:
"The biggest difference has to do with theatrics. Free-running involves a lot of trick moves, particularly mid-air flips and spins. Because these moves are merely showy, not economical—they don’t actually help the participant to get from place to place—they’re considered contrary to the nature of parkour. A free-runner may also move backwards in order to make a move as flashy as possible."
(my bold)
