If we go by the dictionary, we see that regular people are using irony quite well:
(1) the expression of one's meaning by using language that normally signifies the opposite, typically for humorous or emphatic effect.
That's a hipster wearing a hillbilly stgan t-shirt ironically, or someone lauding Epstein as a paragon of virtue, and so on. This kind is well undestood and people usually don't argue over its semantics.
(2) a state of affairs or an event that seems deliberately contrary to what one expects and is often wryly amusing as a result.
This is the kind of irony the article is preoccupied with.
The key, I think, is the situation being "wryly amusing".
I'd say that this kind of irony involves some kind of a "cosmic joke" (a kind of soft or heavier prank the universe plays on you/us). Not literally of course: it's just how it feels.
This definition fits the dictionary definition (2) above, and the article cases, like the diabetic going for his meds and being run over by a sugar (or insulin, even better) truck.
And, let's say that contrary to popular "de-bunking", finding a trove of spoons when you're just looking for a knife (as in Alanis' lyrics), qualifies. As does "winning the lottery and diying the next day" or "a death row pardon two minutes too late" (also lyrics from the same song).
A lot of the semantic arguments against cases of (2) is mostly people expecting irony to always involve an element of (1), or to be necessarily much more than "wryly" amusing case of (2).