No. You are ignoring what is fundamental - that the rules of the game provide for joint authorship under certain conditions.Okay, that's a bit facetious. The outcomes were either, you found spellbooks, thus, you as the player narrated something about the setting, or you didn't, and the GM narrated something that was related in a principled way to something the player authored about the setting, the character of their mother.
This is the whole point of RPG rules (here I sing entirely from the song sheet of Vincent Baker). I've set this point out in more detail in the OP to the "Why do RPGs have rules thread", which I believe you've participated in.
Given that the "transformation" is the entire difference between collaborative storytelling and RPGing as I enjoy it, to say it's not a big one is just flat-out wrong.It's not a big transformation here to see "the player declares something about the setting."
As I posted in another reply, I think to you, understanding the transformation and using it to build amazing RPGs is a huge chunk of Vincent Baker's life work. (Luke Crane is clever too, but he rightly labels "say 'yes' or roll the dice", in the BW rulebook, as "Vincent's Admonition".)