This isn't just books. There are product pages that cover multiple different models with all the reviews and ratings mashed together, even though the models have essentially nothing to do with each other. Like different sizes of Samsung phone but the different sizes have entirely different motherboards/screen techs/cpus/memory.
Click the "nnn customer ratings" to get to the review section.
In the barchart on the left, click any of the "n star" or "nn%" links.
Above the reviews will be a row of dropdown lists, which may include "All formats" or "All styles" or the like. There you can select the individual product variation. You can also change the "n star only" to "All stars" to get all the reviews for that variation.
Unfortunately this doesn't work for the book being discussed here.
Also, I distinctly recall I used to see reviews where between the reviewers name and their review, Amazon added a note saying what format the review was for. I'm not seeing that anymore, either.
Maybe they stopped doing it for books? (Other filters are still there, but not filtering by edition.)
Amazon mostly seems to want reviews to be for a type of product and is fine merging reviews from any seller claiming to sell that product because at least then all the reviews will be in the same place. This is still subject to the problem you're describing (how broadly should different parts of a single review apply).
That isn't the whole story though. For a lot of products people already know exactly what they want and are using reviews to figure out if the seller is able to provide it without selling a counterfeit, without shipping it 2 months late for 2-day shipping, without selling a used model as new, etc.... This still suffers from a granularity problem (does the seller generally do a good job and just not know how to package N64 controllers), but that granularity isn't as severe of an issue as with arbitrary products.