Although the direct reference in chapter 20 was primarily a way for the author to make a statement to us (the readers), given the way things are continuing to play out, it's still amusing to remember that, canonically, Gomi has read Oyasumi Punpun and counts it among his favorites. 🙃
The events of this chapter are suspiciously reminiscent of a scene near the end of a certain other manga called out by name in Gomi's manga collection in chapter 20.
When the first piece of detailed character art in a manga has the girl's spine so contorted that it makes the average scoliosis patient look like Saudi Arabia's Highway 10, you know you're in for some primo garbage. And when one of the first things that happens is the main character passing out...