One point: The article is split in two directions - gluten (which we’ve been consuming forever) causing problems and Roundup/glyphosphate (a “new” problem) causing problems. I have a hard time believing the former, but a much easier time with the latter.
Oats have very little gluten, and OS is just barely over the line for gluten free, so even if gluten IS an issue, it’s not much of one for soylent.
Roundup is primarily used, as the article says, for wheat and soybeans, which makes the oat flour a good alternative, and I’m pretty sure that rice is safe anyhow.
Personally, I’ve been avoiding grains for quite some time (soylent is higher in starches than my “classical” diet).
Seems to me like you could easily run a longitudinal study between a control group fed “clean” non-Roundup grains and the other with glyphosphate laden food. Measure the health outcomes (longevity, lymphoma, obesity, [autism?], etc.) over multiple generations, and that may give you some concrete evidence as to whether glyphosphate is causing these issues.