They're talking about the decline in the purchasing price of a dollar over the past decade, not its value relative to other currencies at the moment
I don't know how you know that, but even that argument is a straw man, unless you're asserting that all of the other currencies declined in value equally against whatever theoretical good(s) you're holding out as the objective standard for value.
I don't know how you know that, but even that argument is a straw man, unless you're asserting that all of the other currencies declined in value equally against whatever theoretical good(s) you're holding out as the objective standard for value.