This is more on copyright law than Google.

> Recipes can be protected under copyright law if they are accompanied by “substantial literary expression."

https://copyrightalliance.org/are-recipes-cookbooks-protecte...

So the fluff is both an attempt at that substantial literary expression, and a way to differentiate this version of the recipe from 1000 other versions of the _exact_ recipe because the recipe itself is not unqiue or copyrightable! Without it, recipe's would be penalized by the duplicate content penalty Google applies.