I think the concern is -- seller A (or manufacturer) has created lots of gamed reviews for product A. Putting a negative review on seller A is much less visible, and leaves the fake reviews in place, so that when successor-scammy-seller-B sells the product everyone is still deceived.
- "Seller was great and delivered on time!"
- "Seller is doing shady things and posting fake reviews"
It seems like both of these would be removed.