Bertrisges law of headlines aside that article is highly suspicious given the sheer number of studies looking for health advantages of organic and finding jack shit concrete. It is a pile of innuendo that doesn't set out to test ita hypothesis.

It could be trivial as a few new virgin test carrot patches vs established farms and get telling results. Yet tellingly they didn't do that simple test for their hypothesis let alone correlaries like by assaying various characteristics like perhaps if slower growth speed has more to do with higher accumulation of nutrients than soil content.