The tag is not going to hide actual copy information that you will have on your website, such as similar products descriptions for different items. Google will only browse by your hreflang tag that articles “a” is a translation of information “b.” Take a look at your Nginx configuration for https://socialbuzzfeed.com/story2857555/etiquetas-autom%C3%A1ticas-hreflang-canonical-etiquetas-seo-options