Thanks for the article.
Federalism is about the sharing of governmental power.
As you imply, states don't have rights. People have rights which they can voluntarily surrender to some extent when they endow the governments they form with certain powers in exchange for some perceived benefit.
The phrase "states' rights" is technically a misnomer. I have used the phrase to indicate that the balance of power has shifted away from the Framers' intent toward a more powerful central government.
But, it's an important point that the term 'states' rights' is technically incorrect since it adds to the confusion most of us already suffer in trying to sort out and straighten out our mess of a government. It helps to remember that only people have rights and we give up those rights to governments pursuant to documents called constitutions. As a result, those governments get certain powers over us.
In other words, our rights do NOT come from government.
Perhaps the phrase 'state sovereignty' should be used to make it clear that the states are each a nation-state and the federal government was intended to be subordinate to the states. And, just to be complete, the states are subordinate to the people who are the ultimate source of governmental power.