Soylent better be sure that they are right. They just fingered the problem onto another company (TerraVia). What supplier would work with Soylent if it turns out Soylent is wrong?
Plenty. Food is a cut-throat competitive business.
Companies that mess up always fix things the first time. Just like Samsung fixed the Note 7 first try. It's not like replacement Note 7s were catching on fire on airplanes or anything... oh wait /s