Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
The description for this product needs to be updated. I bought it thinking it was the newest one (2018) but it was not. Returned it but had to pay shipping to do so. Next time I will read the fine print better