This was Amazon's fault (for re-selling a returned product as new) but it was also the reviewer's fault for blaming the manufacturer instead of the fulfiller.
I see it all the time in product reviews. A one-star review because "PRODUCT ARRIVED LATE AND BOX WAS DAMAGED BECAUSE UPS THREW IT OVER MY FENCE!!!" is a totally useless review and doesn't help anyone, except maybe letting the reviewer vent their anger.
Product reviews are not the place for this kind of review, unless the fault is clearly on the manufacturer themselves, or the manufacturer's customer service has been poor.
Interestingly though, Amazon seems to have addressed this problem in their Marketplace seller reviews. If you view the profile of a Marketplace seller you'll see "mini reviews" of the seller themselves. When people rate the seller poorly because of delivery problems, the review is greyed out and a note says "Amazon takes responsibility for the fulfilment of this order". It's been like that for years, and I don't know why they haven't extended the same system to product reviews.
TL;DR the reviewer shouldn't have written a product review about a bad fulfilment experience, but Amazon should improve their website to make the distinction clearer.