Techies loved them, there were articles about Soylent all over HN. Soylent itself got backing by Alphabet and Anderseen Horowitz.
I haven't heard about Soylent that much lately, however, and the buzz (or hype?) seemed like it died off.
Reading an article on Yahoo! about them, it seems like they pivoted recently, with CEO from Kraft. Which made the company profitable for the first time.
https://finance.yahoo.com/news/soylent-once-beverage-tech-bros-143516284.html
It turns out, like most products, there is a limited market. Solyent / Huel were only able to convince a few people to develop an eating disorder and that's probably a good thing.
It's ordinary knowledge in their social circle.
Objectively, it's just another food product and the likely exit has always been acquisition by a food conglomerate.