It’s that the method is contingent on things that are out of his control (the salary cap going up every season) and we have very clear evidence that this method does not provide any sort of advantage and only puts the team at unnecessary risk.
I disagree with this to a degree. They needed to stop doing it a few years ago and they definitely need to stop signing older players to contracts with a bunch of void years that accelerate into the cap making it impossible to move on, but it's a method that worked really well for 10 or so years keeping together a roster that was competing for championships.
It made sense and it worked when you were doing it to keep great players and you had a great roster 1 to 53. But it no longer makes sense when you are doing it to keep aging players that are well past their prime and you have a roster with few very good players and no depth.