Disclosure; That article is behind a paywall for me.
This is a "market" thing. When the value of the dollar (against another currency) goes down, the "purchasing power" of our money is less. Market 101. The dollar index they are talking about is the value of the US dollar against a basket of other currencies so it is going down against many.
Depending on what flavor of economic/fiscal theory you buy into, this comes into play. In this case, a cheaper dollar is good for US exports. On the other hand, it is bad for "our" consumer because our money doesn't go as far.
When TPTB decided globalization was a good thing and took advantage of environmental and wage arbitrage through slave labor and 3rd world countries to exploit and dump waste, our goose was cooked. We went though the industrialization era of mass produced automobiles and other products - the hey day of American workers - to shipping our jobs and production all over the world. The giant sucking sound as Ross Perot said. I lived it, I watched it. I even helped it happen, and I hate that. But I had to eat.
It's too late. All the jobs we lost are not coming back, and on top of that, any that can be replaced by a robot, will be. Even if they tried, it would take years. That's assuming the ****wads running this place actually give one good ****. But they don't.
I don't know if they are all actually this economically illiterate, or just play the role on TV.