Of course blocking on weeks wouldn't rule out long-term side-effects. (Nothing would, short of a multi-decade RCT to investigate all-cause mortality.)
My point was that he hasn't even done that much. Yet, he is happy to blog about the 1 week he took off Soylent to fly to LA and how crappy he felt wandering around a strange city and how this proves normal food sucks...
Rob Rhinehart's food replacement Soylent now has a crowdfunding campaign.
If you're interested in one or more of these benefits, send in some money! There is also a new blog post.