The tag won't hide genuine replicate written content that you could have on your website, like comparable product descriptions for different objects. Google will only read by means of your hreflang tag that content material “a” is actually a translation of written content “b.” Placement of hreflang and canonical tags https://addons.prestashop.com/it/seo-indicizzazione-naturale/30904-tag-hreflang-automatici-e-tag-canonici-seo.html