That's just every Soylent thread, or more broadly every nutrition related thread. It's one of those things everyone thinks they know a lot about, whether from investing a lot of time and money into a fad diet or just from watching a youtube video with more emotional than scientific content.

Since small changes in diet don't really affect the health of most people when compared to the sum of everything else, I imagine we tend to get a lot of meaningless confirmation, too. One time I gave up on eating vegetarian because I was feeling worse. So I wrote off the idea of vegetarian meals for years. Looking back on it, the problem was probably more about my extremely high stress levels at the time than the food.