Ninety-five percent of everything said in the forum about what “Amazon does” or “Amazon wants” is just conjecture (even though it is often said with great conviction).
My personal conjecture on this is that what happens when a complaint is made depends on the history and longevity of the seller on Amazon. New sellers slapped with an inauthentic claim will have a harder time of it, and may suffer harsher penalties, than a long-time seller with an exemplary record. But I’m just guessing - most things Amazon-related are just a black box. We see or hear of something and we fit a theory to it to explain it - right or wrong.