Survival Fitness Plan Mountain Bike Riding Training only covers basic mountain bike riding skills. Anything else is more for show and is unlikely to be utilised in a chase scenario.
Riding is included in the Survival Fitness Plan because bikes are one of the most common non-motorised form of transport you will encounter. It also has a couple of other very good benefits:
It is a low impact form of exercise (much better for your knees than running).
It is good for the environment.
The focus is on mountain bike skills because they can be transferred to urban obstacles. It is the skills that are important. You do not actually need to go find mountain bike tracks, especially if you are a city dweller. It will be more beneficial to learn in the environment you most frequent.
Also, you don’t actually need a mountain bike. Use a BMX if you prefer, or whatever you have.
Once you know the basics it is just about practising the techniques and building endurance. Don’t get too used to gears. The bike you pick up off the street when running from your enemy may not have them.