Author of the post here: I don't think it's a good idea to put your clanker to a PR and then try to explain it. That's because you are then reading a derivative work of a derivative work instead of going to the source.
If we fail to explain it, then we need to do a better job explaining it :)
"Now we talked so much about Codemode, it might be worth explaining what that even is."
Yeah YMMV. FWIW I did that earlier today and I think I got a better idea about what codemode is than the changelog and the post