Max V is obviously much more important in the 100m than it is football, basketball, baseball, soccer, etc. Even so, I think the statement is speaking to Speed Endurance. IMHO, most of a novice sprinter’s improvement is probably going to come in the first 30m (accel) and last 40m (SE), at least in the first year or two. Its seems that its much harder to improve Max V, the middle 20-30m, than it is to improve the beginning and the end of the race. But that’s just my take on it.