This is an article about the movement to produce similar foods to ones that already exist without the need for animals; specifically, they discuss the stables of milk, eggs, and meat. The people in this space are not gunning for "something that happens to vaguely serve the same nutrition goal", but are trying to provide stuff like egg whites that are so similar to real ones they can substitute when baking and meat designed for people who, well, actually like eating actual meat.

Soylent is part of a mostly unrelated movement that instead tries to provide a fundamentally different premise for the food itself. I would not expect Soylent to be mentioned in this article. Reading your comment and other peoples' responses, I had assumed I would be seeing their competitors (mealsquares, huel, etc.) be brought up, but no one from the entire space Soylent is in was mentioned, as that just isn't what this article is about. Maybe the title was confusing from that perspective, as this is more "reengineering the meal" instead of "reinventing the meal"?

I think the bout of people getting sick in late 2016 / early 2017 dampened enthusiasm significantly.

Soylent is sold at Walmart now, so it seems they’re still around. https://www.walmart.com/ip/Soylent-Meal-Replacement-Drink-Ca...