Buy Button Embed Code SEO

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I’m using the buy button embed code method to add many products on my wordpress site (using the template where the product photos and description are included).  I found this post where the reply states that the buy button "isn't the best" for SEO and I’m seeking more details as to why and to what degree it isn't the best.  I notice the product content is not included in the source code of the webpage, but my page does show up when I Google-search an excerpt of my product description.  How does Google get this content and is how good / bad is this method for SEO?  The post I linked to above also mentions the buy button embed method eliminates the ability to use “rich snippets.”  How important are rich snippets?  Can they be added with WooCommerce?