Having dealt with the EPA at both the state and federal levels I can tell you without a doubt that many policy decisions are made by lower rung individuals without any quality control from up top.
I'm glad to hear the President has poo-pooed this report and believe him when he basically says he had no part in it. The President has done quite a few troublesome things in the past few months, but this ain't one of them. It's basically a non-issue now. Too bad the cretins that released this report will only be re-assigned to new jobs as opposed to fired.