This reads like Sellvia wrote it themselves
Not saying Sellvia isn't legit - it probably is - but anytime everything sounds this smooth, I get a little suspicious. Ecommerce is never that clean.
From what I've seen, it's more like: nice setup, decent system… and then reality hits when you try to get actual sales. Traffic, ads, testing - all the fun stuff nobody mentions in "it works great" posts.
So yeah, I'd say it's a tool, not a cheat code. If you know what you're doing, maybe it works. If not… well, welcome to ecommerce