Azuaron said:
...none of that is ironic. Irony requires an inversion of expectations or statement
Um, you mean exactly what is described on the page? The punished aren't expecting their greatest sin to be turned against them for eternity, or presumably they wouldn't have been doing it.
Hell, they even provide an example in the first paragraph; a glutton, one with a voracious desire for something, usually excessive eating, would expect to eat excessively. So they're starved for eternity. Even if he has at any point said 'I want to eat', then that's still technically an inversion of statement. The "expectations vs. outcome" variety of irony doesn't get any simpler than that.