This is beyond grasping at straws. Shopify performs a service, Herbalife does not. Shopify recruits people, Herbalife sells inventory. I don't see Shopify asking for upfront payments from their affiliates. Not to mention the fact that a successful Shopify store relies on skill at SEO, social media and picking the right products. Herbalife relies on being early enough in the "reverse funnel" and having a lot of people…
Other than that though there's very little relation between the two Shopify really doesn't sound like a pyramid scheme even from this page.