Does this mean they're going to make their own product? Currently, Soylent, the company, is just a marketing operation. Everything else is outsourced.

That's not an unusual strategy for hype-based products. Skyy Vodka and WD-40 were completely outsourced. Skyy Vodka was originally made by Frank-Lin Distillers Products in San Jose, the company that makes most of the low-end booze on the West Coast. Frank-Lin buys bulk ethanol by the tank car load (they have their own railroad sidings), does a little post-processing on the ethanol, takes in tap water and runs it through a deionzing plant, mixes them, adds flavoring, and bottles. They have a really fancy automated bottling line which can handle about a thousand different bottles and can change bottle types automatically. This is called product differentiation.