Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Haven’t seen this yet as it is a gift I ordered for my son who lives in Australia. I live in Scotland and all I know at the moment is that it has arrived. I am sure it will be fine as this was his favourite aftershave for many years.