When I see monsters like these I always think HF escapees...They are so big they just don't seem naturally possible to me. Congrats to the guys, not calling anyone fake or dishonest, I am just in awe!
They are really a different deer. Different subspecies of whitetail that are large bodied. The does in Illinois are bigger than our bucks here.
When i hunted in Ohio the guide i was assigned had a family farm just up the road. Every year they killed a 180" or better deer. few years back they shot a 195" Big Corn Fed Midwestern bucks.
There is alot of agriculture but not alot, if any supplemental feed. Food plots are common but they are not pouring the protein feed to them like we do down here.