If the core point about the poverty line being based on inflation adjusted food prices alone is correct, then the piece holds up very well and explains a hell of a lot about how life feels in the US right now.
[edit] if the “the line you see on charts is still just 3x food costs” thing isn’t actually true, through, then the article gets a lot weaker in a hurry.
[edit2] FWIW the Wikipedia page on this topic (https://en.wikipedia.org/wiki/Poverty_in_the_United_States) largely confirms this, raises some similar points about potential problems with the “poverty line” today on basically the same grounds as the article, and reading it gives the same sense of standing on a deck of a ship that you’ve just noticed is leaning alarmingly toward starboard as the linked piece.