Didn't watch, but did they ask him how exactly his plan would work for a family with say 4-8 kids paying private school tuition?
He answered that basically the numbers don't lie. And what will happen is A. You will need to increase your income. B. You will crash and burn. One way or another this will be the outcome. So be hyper focused on option A.
He didn't say that your life can be cheaper. He said even if your life is more expensive, the math doesn't look down and say that they won't apply to our community.
Pay down your 2% mortgage with your 4% APY savings account makes a lot of sense.
NOT!
Obviously these numbers sound messed up. But if you understand that money is 80% behavior( that's what Dave said) then you understand that although the math might not make sense, the overall concept does