Earlier quoted context omitted.
On Amazon I searched in "CDs & Vinyl" for the band "The Birdstones". It showed me results in books. Criminy. Amazon does this all the time. If I wanted a book, I'd have searched under "Books". I am not confused about the difference between "CDs" and "Books". What's the good of having categories if they're completely ignored?
I was curious and tried it myself. The search results page explains -- right at the top -- what is happening: Showing results from All Departments No results for The Birdstones in Music, CDs & Vinyl I think this widening of search scope is not unreasonable.
Realistically neither of the above were the concern. It's an attempt to boost engagement in the hopes that you'll find a product for eventual purchase, nothing more.