I haven’t watched the video, but I would be very surprised if the budget could be balanced by only eliminating all discretionary spending.
It’s going to take cuts from entitlement programs up to and including Medicare and Social Security.
Mathematically, it can be eliminated by eliminating all of the “discretionary” spending. But the point is that the “discretionary” spending is not really discretionary, in any real sense of the word. You can’t shut down the military in its entirety. You can’t shut down every branch of the government in its entirety, leaving only the “mandatory” spending, which is not really mandatory.
To call anything mandatory is pure sophistry. If there is no money, then that “mandatory” spending is not mandatory. And if voters won’t let you increase taxes, print money, or borrow money, then there is no money.
So it’s just a question of how long it takes for the voters to get to a point where they demand that politicians stop increasing taxes and printing money, and the markets refuse to loan money to the politicians. It might take a while here, but they’ve already reached that point in Greece and Spain.