This is part of an actual new rule: Mookie uses dialogue to remind himself of story points.
As was mentioned earlier, a lot of dialogue seems to exist just to recount things that have just happened or to tell us what is about to happen. IMHO, this is more Cargo Cult Writing, this time cribbed from comic books: there it helps to remind readers of what happened months or even years ago (as comic books published on a weekly or monthly basis). Here, it is clearly unnecessary since Mookie is writing a daily (ish) webcomic but that's what makes it Cargo Cult style