They need to call this not the NST, but call it the "screw the anyone who saved some money tax."
For example, $130,000 income. You pay $30,000 income tax. You spend the remaining $100,000 on five cars that cost $20,000 each. The $20,000 includes roughly $4,500 in hidden taxes passed on to you from the chain of suppliers to manufacturers to delivery/transport to car dealer.
Spending that same $100,000 under a NRST you'd pay about $15,500 for each of five cars -- $4,500 of hidden taxes have been eliminated --totaling $77,500 and fork over $22,5000 for the NRST. Your $100,000 savings goes just as far with a NRST as it does with the NRST.