Given Essence just became available here on AG I suspected he hadn't actually tested it yet. Even if he obtained a sample at SEMA I'm not sure that would be adequate time to say definitively that it won't work.
IMO his comments also seem to based on the idea of traditional glazes and fillers, which clearly Essence is not, though I can agree with his thoughts on traditional glazes and definitely wouldn't try applying it over say Megs #7. I look at it this way...Gloss-Coat and Opti-Coat are compatible with Opt polishes and ONR. I know there is something left on the surface after using the polishes and ONR is said to leave behind protection of it's own. If these coatings are compatible with those ingredients is it to far fetched to think they may be compatible with Essence?
Rather then sit here and speculate, lets wait and see actual results from testers with no vested interest in either company. I know a few have already started testing so now it's just a matter of waiting. Or you can always just try it for yourself. Both products are simple to use so your only out a couple hours time and a few bucks if it fails.