I’ve found this lesson difficult to digest when I tried her approach. It’s actually where I fell off and lost the interest the first time I tried to learn the language.
The comparable lesson is primarily https://kellenok.github.io/cure-script/7-5-conjugation.html, not the one you quoted. I prefer teaching it before the -te form because it’s more orderly.
If we reorder these two lessons and rely on romaji over kana, you basically get my approach. I found it helpful so I wrote it down.