No, he's right.
Unless the 16th is repealed with an amendment forbidding income taxation at all levels (federal, state, local, international), the progressive income tax would simply come back on top of the FairTax the next time the Donkees seize control.
The problem is, constitutional amendments are hard to pass. So, Dr. Rahn has it right.
House Joint Resolution 104 will repeal the 16th Amendment.