The list is total bunk - Minnesota and Iowa anywhere near this list is bogus. Ha Ha. I shot 8 deer in MN within 4 days a few years ago and the place is still stocked to the gills. So that is bogus.
Iowa - never hunted there, but it can't go from one of the best to one of the worst in a few year.
List is total bogus and doesn't really even give any decent evidence. I'd qualify this list more as click-bait and to create controversy than a realistic list.
Wide Open Spaces is known in the marketing world of hunting and shooting to push out bogus articles with no proof.
The guy that runs it is 100% marketing guy:
http://www.wideopenmediagroup.com/denis-odwyer/