Yup was going to post this as well.
I have a deep fat fryer, and even in that it's not quite the same.
I once looked up a pressure fryer "broiler" I think????? A used gas fired commercial one was about £3k.
I made a big deep fryer out of a used calor gas bottle and an outdoor gas burner, works really well you can do a ton of chicken in it at once, I originally made it to cook a whole turkey which I have done once.
The KFC recipe has been leaked online, so with that at a bit of practice you can get pretty close, but without a pressure fryer you can't get it quite as good.
Edit: seems like everything these are more expensive now: