This statement is utterly and completely false. You can examine the consumer protection laws in pretty much any first-world country to see that sale-of-goods laws and first sale doctrine both apply without mercy.
As your argument is based on the quoted premise, which is sadly factually incorrect, I read the rest of your objection to the article as logically failing.
When you buy something over-the-counter, it does become your property, in all its aspects. Any restrictions to your property rights over the object you bought are just that; restrictions of your property rights.
The copyright monopoly is one such restriction of your property rights.