I see a few issues with the program in general, and then some questions.
As for the program its all primary movers without any exercises directed towards core, stabilization or fixator muscles. This is a recipe for muscular imbalances and increased risk of injury.
2. There are no unilateral movements. Split squats, RFE split squats, lunges, etc. are all useful when creatining a balanced coordinated athlete.
3. There is no unloading period.
4. There are not nearly enough pulling exercise. No program is complete without pullups.
A lot of high school football coaches like to put the horse before the carriage...especially if they have no formal training in youth strength and conditioning.
My questions than would be in regards to his training experience. I am a big proponent of a quadrenial model for high school athletes. An example of such would be something like
Freshman year (low training experience): Focus on movement patterns predominantly. The first phase would be teaching athletes how to perform body weight squats, pushups, pullups, body weight deadlifts, etc. with good form, and working to correct muscular imbalances that affect these movements. The next phase would be on actually doing these exercises with weight and still working to create the base. the goals of this year are all process based, not performance based. Athletes should be encouraged to master movement pattern, not significantly increase weight or performance.
Sophmore year: During this year the movements become more specific and the goals are a mix of process and performance. Here we are trying to improve specific aspects of athlete performance...such as running faster or squatting heavier.
Junior year: The training becomes more specific, such that the goal is to improve sport specific performance. Here is where the hang clean might would be introduced now that the athlete has a good base of movement pattern, a strong core, and the coordination to make the most of the movement.
Senior year: Peaking. This is where a typical periodization program would be used culminating in repetition maximums toward the end...such as that in your sons lifting program.
I refer you to the following paper.
Jeffreys, I. 2008. Quadrennial Planning for the High School Athlete. Strength and conditioning journal, 30(3), 74-83.