You don't have to do the program as is. You need to understand the principles so that you can make modifications if needed. The "opposite" article was not meant to give a program, it was there for illustration purposes. The concept is doing the opposite of what you normally do. Using methods, exercises, loading schemes that you never use spread over. Training split that is different nd new to you.
If you are doing high reps, do low reps
If you re doing 3 sets per exercise do 5 or 6
If you are doing 4 exercises per muscle do 2
If you are hitting each muscle once or twice per week try training the whole body 4x per week
If you are doing each exercise by itself do antagonist pairings
Or vice versa...