But the whole point is that soylent is moderation. Everything in it is balanced, so if you eat only soylent, then (in theory) you shouldn't be getting too much of anything.
>It's likely that he's chosen at least one ingredient that is harmless in moderation, but is detrimental to your health over time.
Why do you believe that that is likely?
>It's also quite possible that there are other things he's underdosing on and hasn't discovered yet (like sulphur before batch #7).
Yes, this does seem quite likely. There is probably a significant number of necessary nutrients that nobody even thinks about because they're ubiquitous.