This is utter rubbish that in no way serves ordinary Americans.
Ordinary Americans defined as those who insist on buying imported products and traveling overseas?
I’m not so sure. I sell to the US and demand has dropped significantly, because with the dollar worth less the price (to you) of my products has rocketed. On the other hand, my friend plans to vacation in america next month, at least partly because she can get so many dollars for sterling. That in a nutshell is what this guy is talking about. Weak dollar means you buy less from other nations and they spend more with you. Which is good for the US.
Of course, this is on a macro economic level. I take your point that poor John Doe doesnt get to see much of the benefit of all this.