The majority of his drills are aimed at improving elastic strength, when the legs are nearly extended, the muscles function quasi-isometrically and the tendons generate huge forces. In other words what happens after 30-40m when the body is in the upright position.
So for a football player, who mainly needs to accelerate for a short distance, which requires a more explosive concentric type muscle action, they would not be that useful. Furthermore, these drills require quite some practice before you’re able to do them correctly, and may not be an efficient use of your limited time.