I don't think this is true. Taking notes like this is shown to help with the ideas and knowledge you retain after having read the book (surprisingly: if you take the notes by hand it is better than if you type them somewhere).
I often take notes while I read books or attend meetings without ever having the intention of using them for anything. It helps me memorize the important bits of the thing I spent some time of my life on. And then it can simmer within me, mix with some other books, movies, music, experiences and come out as an really new idea. And then potentially I could go back to the notes (I rarely do) if there is something I was not sure about.