There are many sub 10 people who didn’t squat 2x bodyweight. Westside may be okay, but any form of progressive overload will teach someone how to handle plenty of weight for anything that isn’t powerlifting or weightlifting.
It’s safe because they use things like box squats which forces you to have good technique and trap bar dead lifts which are not as demanding as regular deadlifts and much safer for tall long limed athletes. It’s also safe because they frequently rotate basic lifts which allows you to avoid boredom and over use injuries of the same muscle groups.
Box squats are only safe if done correctly, just like any other lift. Plenty of people do a terrible job dropping down and bouncing off of boxes, just as plenty of people that abort many other lifts. Rotating lifts isn’t necessarily good for a sprinter and most people think you shouldn’t…