Because others marked the review as helpful, Amazon increased its visibility on the product page, just as the Barons "were executing a plan to triple their annual sales to $3 million in 2020"
The fact that any returned diaper is resold is fucked. "Amazon should have inspected it" isn't good enough and whoever is in charge of the policy for returns of a diaper to ever be resold can screw off.
If it's Amazon, and Amazon is responsible for that diaper being shipped back out, that review should definitely be removed.
But regardless, "we were just about to triple our sales" is best case complete nonsense, and worst case nonsense stacked with scalping essential goods during a pandemic.