Just a little note about the word “model”, in the article it’s used in a way that actually includes the weights, and I think this is the usual way of using it! If you change the weights, you get a different model, though the two models will have the same structure.
Anyway, you make good points!
I’ve read that it used to be “heels over head” as in upside-down, but then somehow the words got switched around (I found this page that claims the same thing: https://www.phrases.org.uk/meanings/head-over-heels.html ).