NOF: Saints in position to get under the cap with ease and create another $30+ million in cap space to add new players

Because it’s treating all teams and how they, specifically, use the cap as being equal.

Harley has been at the forefront of pre-writing stuff into contracts and then exercising them later.

Just because other team CAN do the same doesn’t mean they have or do. Thats the key difference. The chart is irrelevant outside of hypotheticals which don’t actually occur.
Practically all NFL veteran contracts have restructuring clauses in them, it isn't unique to the Saints. It's irrelevant that our strategy is different, the chart shows how much space each team could create if they decided to copy us and go on a restructuring spree like we do.