The health concerns published by that outfit that later went after hot dogs were largely proven bogus by more credible sources. It was a big deal on the news after they scared the bejeebers out of the industry and had many of us putting dividers in our warmers so we could sell popcorn made with fishy-smelling canola oil ... grrrrrrr!
Coconut oil, like water, will kill you if you inhale it, inject it in your veins and live on a total diet of it for 42 days straight. If you're an occasional imbiber, you're probably not going to die from it.
That being said, I believe the only credible theatre popcorn is that which is popped in coconut oil and Flavacol. Of course, that comes from a 35 year habit!
As for topping, we use O'Dell's Superkist 2, which seems to be a good compromise between nasty canola-topping and real butter or butterfat.... though I personally like butter. Seems though, that butter tends to soak into the popcorn more than the oils do, raising the possibility that the corn can go soggy.