Likely a shit study like all the others that try to do this. The reality is that there no real difference. This has been proved over and over again; but these idiots have an agenda and will never quit.
I know you're probably a troll, but this is science: nothing is ever "proven", nothing is ever 100% certain, and they mentioned in the press release why this study is better than the previous ones that show no difference between organics and non-organics (basically, it used way more data and it's newer).