An audiobook* is "an audiocassette or CD recording of a reading of a book, typically a novel." Granted, this definition should also refer to digital, but it's not my definition.
Anyway, somebody else reading and recording a book is not ME reading the book. They read the book; me listening to it is passive. Someone whose fingers are their eyes are, like me, actively engaged in a way audiobook users aren't.
*Amazon - which owns Audible - wanted me to spellcheck the word, but did not make the same suggestion when using the two individual words.
https://www.merriam-webster.com/dictionary/audiobook
Listening is not a passive activity. At all.