They do have the best HS wrestling program that I have ever seen. The sheer amount of difference makers that graduate from Apple Valley every year is ridiculous.
Agree that Apple Valley is an absolute juggernaut, but St. Ed's or St. Paris Graham in Ohio could make about as strong a statement. I need to rewatch the finals but I thought I heard them say that one of them (I think it was St. Eds) has had at least one D1 AA each of the last 25 years.
Also, I did specify D1 in my original statement. Iowa is probably still the strongest in the lower levels if you look at JUCO (Iowa Central) NAIA (Grand View) and DIII (Wartburg)