I don't see it as being all the much for reps- it's bodyweight, and those aren't high numbers at all. A lot of bodyweight workouts crank up the volume, so that it takes more endurance than strength to finish.
Mark seems to be trying to get a full-body strength workout scheduled in two days per week, keeping it short enough that people will actually do it. Making it impossibly long, complex, convoluted, or confusing is just going to discourage people. The best workout plan for a beginner is the one that he or she can actually stick to. If done at a sufficient intensity (not to be confused with speed of motion) You can get great benefits out of this program.
Personally, I use Mark's template for sprinting and moving slowly, but use Convict Conditioning for my lifting of heavy things. It's a similar program, but with more levels and more details about how it works for strengthening.