I might be wrong, but, wouldn't the recommendation to avoid Amazon if you want to be sure come from the massive amount of training data pulled from internet conversations? The kind that would already have been discussing the issue of counterfeit products on Amazon being mixed in with legitimate products from the original manufacturer, since this is a problem that's been going on for, what, at least a decade at this point, right?

The LLM is inherently distrustful of Amazon due to having consumed and trained on a bunch of text that's about how one should be distrustful of Amazon.