I ran into this before, the reviews were for something completely different than what was being sold, and there is no clear way to report it. I was resorting to reviewmeta and fakespot for a while, but they're getting muddled up (actually, fakespot became useless all on it's own, due to changes that were made to hide all meaningful insight). Anyway, Amazon reviews have really become completely worthless, because of -
1. Sellers gaming the system.
a. Switching the product associated with reviews (as cited in original post).
b. Creating fake accounts and selling to them, so they can write positive reviews (see news about people inexplicably receiving seeds in the mail that they didn't order), and become a "top seller."
c. Writing negative reviews for competing products.
2. People with grudges posting negative reviews (see review bombing).
If I can, I try to find a reputable review of things I want to buy, but that is hard to do because -
1. Companies are constantly churning out new models.
2. So many options exist for given competing products, it's nearly impossible to find more than one review of the same product.
3. Horrible search results that list sites I've never heard of before.