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.
Was detected and installed in Smart life app however was not detected by Alexa with Smart Life Skill. In app also, against the bulb, did not show Third Party Control icons like Alexa, Google home etc. Looks like a bug. Have ordered replacement. Will update.