By unique information, do you mean descriptive adjectives or product features? If so, these terms more often than not show up right in the title:
ProBien Case for iPhone 11, Liquid Silicone Phone Cover w Tempered Glass Screen Protector, Shockproof Durable Protective Rubber Cases Full Body Drop Protection 6.1 for Women Girls-Wine Red
60 Pack Guitar Picks,Cowalkers Abstract Art Random Color Celluloid Guitar Picks Plectrums Unique Guitar Gift For Electric, Bass & Acoustic Guitars Includes 0.46mm/0.71mm/0.96mm
COMFEE' Rice Cooker, Slow Cooker, Steamer, Stewpot, Sauté All in One (12 Digital Cooking Programs) Multi Cooker (5.2Qt ) Large Capacity. 24 Hours Preset & Instant Keep Warm
All of these items were on the first page of results for a single term (iphone 11 case, guitar pick, pressure cooker) so not only is Amazon failing to enforce TOS rules and guidelines against keyword-stuffing, the trick clearly works for sellers.
The achilles heal for sellers is that their listings ultimately need to show up When searching for unique information specific to a particular product. They’ll often try to hide that in an unrelated field or in the description. Usually a seller uses the same “trick” for all their listings.