Quite so, a slip of the finger. But the point isn't whether it's 5ppm (invisible) or 2ppb (invisible) it's that aflatoxin does cause liver cancer, and sure, it's not many-- in a statistical view anyway. But out of a global population of 6b, how many liver cancers would you expect a year from peanut butter? Ten? A hundred? Even a thousand? Like the aflatoxin itself, invisible statistically-- but not to those affected.

Biologist biologists. One's a cancer researcher at NIH, one's a prof at a New England college (the college is highly rated and so is the prof) and a third is a garden variety biologist in between jobs.