Amazon is a retailer. Soylent is a manufacturer. It has plenty of capital to not have to worry about inventory turns. Manufacturers need to worry about making a good product and getting into customer hands first and foremost. Financial shenanigans are a distraction for a budding manufacturer.
Speaking as someone who has worked at a few electronic hardware OEMs (and been involved in production), I can tell you that inventory cost and risks are a significant concern.
