So if Walmart.com has a million products that are drop-shipped from whoever, those would be/could be still considered "sold by Walmart"? Or are you saying this is equivalent to Amazon, but only started yesterday

Something sounds odd, because I interviewed with a no-name company that handles this sort of thing close to a decade ago, and while I don't remember if they did it for Walmart, they provided similar fulfillment services for several large e-commerce websites.