Some islands hold deer occasionally but, they are definitely hunted. I have heard in the past couple years they've become quite popular. Just think about it everyone thinks they'll be a magical place away from others.
the one i hunt was definitely slower this year than others. they can be good and over crowded at the same time. once the guns start popping the deer are hiding, and a lot of those islands are extremely thick, so they have plenty of places to hide.