Shopify SEO is not a generic SEO checklist applied to an online store. Shopify has its own catalog structure and implementation constraints. Products, collections, filters, tags, navigation, themes, apps, internal links, canonical signals and market settings can all affect which URLs search engines reach, index and understand.
The important question is not only whether general SEO best practices have been followed. It is whether the right Shopify pages are reachable, indexable and clear enough to answer the searches that matter to customers.