Cool, site, thanks for the link!
It looks like he had the same issue (well, issue to me since I prefer clear over haze) with steeping vs boil...
http://brulosophy.com/2016/05/02/hop...iment-results/
Looks like he added Whirlfloc at 5 minutes and it had less effect in the steeped recipe. I'm betting you're right on the gelatin though, but to be honest, I'm too lazy for the extra step with how clear my beers are just using Whirlfloc and a cold crash.