The ideas of post-irony and meta-irony that iDubbbz talks about in the video were popularized in 2020 by political satire YouTuber Jreg:
...and Jreg put out a video today giving his thoughts on Ian's segment about irony:
Jreg's model of irony was layers stacked on top of each other, but iDubbbz made the circle model himself. Jreg also shows that a lot of iDubbbz's points in the segment were basically lifted from Jreg's video (he isn't mad, but he still points it out), and in general gives light critiques of how Ian handled it. "I don't think he understands meta-irony" lmao