How funny. In America, almost everything is “income.” That’s just how things work. Heck… you can’t even win a prize without that being income. About the only thing that is not income is a gift or an inheritance, but even those are easily taxed by our government.
The heart of the argument against wages being income is that there is no taxable gain when you “exchange” your labor for money. They claim that you actually have a “basis” in your labor (kind of like it has inherent value) and you can exchange it for the fair market value of wages without a profit. No profit or gain means no taxation, to those who argue against income taxes.