I was going to recommend that you call to double check that they have not changed their policy, but I have seen people I know open carry on the property during KOH qualifiers. These were people I am fairly confident would have checked ahead of time whether or not they could, but as you have found out they welcome it with open arms. Pun intended. I would have been seriously shocked if they did not allow it considering the park land has been cared for by a local hunting club as far as I was informed.