Took me a while to track it down, but I think this is the book to which you were referring.

https://angryflower.com/348.html

I make no cleans about the stances of this artist; I just saw this strip years ago.

Also uses ableist language.

This screams Dresden Files.

As an exmo, it is specifically a ban on coffee and tea (not herbal tea, caffeinated tea). Some are strict and extrapolate this to mean “caffeine” and some are literalists that chug Mountain Dew. It’s very weird. As an aside: one of the names of ephedra is “Mormon tea”.

Honestly, I count using the four fingers for 1-4, close the fingers and extend thumb for five, then extend each finger again for 6-9.

The right hand counts tens and works the same way. Can count to 100, and it’s pretty intuitive. It’s like if positional notation was discovered way earlier.