I haven't seen the associated talk, but (a) I would imagine the author chuckled while reading this, because it's sort of a joke among scholars, and (b) the point is likely focused much more on the context of presenting research (e.g., at conferences) rather than a blanket ironclad rule for all presentations you ever make ever.

While I think there's some validity to your point that the author's presentation suffers excess verbosity, I'm not too worried about it because the linked slides seem more meant to act as a reference document than an example of a good presentation, and the level of text is just fine for that purpose.

Yeah I’m the author, this was a joke. I also wanted to convey to the students in the room that this was not a high quality presentation, more so text just converted into presentation form.