cooking my self I can manage a (I hope) tastier alternative for less,...
Sorry, but I really don't get why this is interesting at all
You answered your question in the first word of that quote. Soylent buyers don't want to cook. Many of them don't know how to cook. Few of those are interested in learning. I spoke with a man who literally gets anxiety just walking into a grocery store and seeing all these things he has no idea what to do with.
I think it's nutritionally foolish ("science" has a moderate but incomplete conception of nutrition), and I think with my stomach, but that doesn't mean there's no use case.