Re: Not much of a chemist then?
They made a mistake, including a trace ingredient which is unnecessary, and which was always going to cause problems for a significant percentage of the population. So, they have to remove it.
Bottom line, your idea that they have to redo all of the testing is rather implausible. If the amount of tallow is so low, it's not likely to be a critical component, or have a critical impact. Tallow is pretty much just fat; it's not a specialist compound.