My point was that he created the formula through trial and error (I distinctly remember he said he'd put whatever amount he read online was correct and then if he felt sick he'd adjust the amount down; but "getting sick" is a rather extreme indicator). That is, at least prior to investment money (which I hope was at least partially spent on testing the stuff for safety), his safety claims were based off "I didn't get sick in the short term" without any real data on the medium to long term effects.
I mentioned small amounts of poison only as an anecdote that his trial and error testing could potentially have been harming him without him knowing it. That is, it's simply an anecdote to demonstrate that the "safety tests" he had done up until that blog post were themselves anecdotal at best.
I haven't been following soylent since and assume (and hope) that since he took on funding that he then followed up with proper scientific procedures. But people ate his stuff based on that initial blog post, so...