The squat developed into a popular core lift in the middle of the 20th century, and became readily available once power racks were developed as a way to mount the weight to weightlifters' backs.
Thankfully, you'll never know what it's like to load a barbell at an angle and tip it onto your shoulders as you saw in the "History of the Squat" video. Modern advances made the squat doable. But you, in your gym, with your goals and your max... You are the one who makes the squat the defining element of this training program.
This program isn't about the strongmen of yesteryear. It is about your dedication to building an iron mind and body. Load the plates. Get stronger.