"Disservice" is not a verb. You can say "does a disservice to the book" or "diminishes" it.

English generally allows verbing nouns.

I think it's cool and understandable as a sign of reciprocity.. if the book deserves the blurbs then really the blurbs deserve the book they're stuck with. Of course there is not always reciprocity, but apparently aye in this case.

I suspect that the use of "deserve" was just the result of a bad translation.

https://www.larousse.fr/dictionnaires/francais/desservir/

sorry, I was confused by a French similar word. The intended meaning was "to harm"

*disserves

That makes sense but for some reason in my eyes it seems weird as a verb; the noun “disservice” is more common, or saying something is “doing a disservice to” something