To anyone who's familiar with the topic it's immediately clear from the copy that the author understands it.
Considering that the target audience is other designers, why does the presentation matter?
I fail to see the logic here. Good design helps people learn easier. It's not like designers have some unique ability to learn equally well no matter how poor the design is.
It's not like he used gifs or flashing colors.
Now I kinda want gifs and flashing colors.
IMO it totally kills it. Others may not have as strong of an opinion. This is the age old question about separating art from the artist. With authoritative didactics, especially as a stranger on the internet, it is even more important to associate art with the artist so to speak. It comes with responsibility.