Beautiful images Trent!
I don't get to capture birds too often, at least really good birds. I would equate going to a wilderness park like this with having items in your backyard like a bird feeder, etc that brings birds to you that might not otherwise come.
I was at
@Eric Gofreed backyard a few years ago, and he has a small bird blind and a backyard that is very attractive to birds. He let me shoot in that blind for a couple of hours feeling like a kid in a candy store as bird after bird would fly in and land while Doug and Eric sat back and chewed the fat.
Technically that wasn't totally in the wild, but I wouldn't call it cheating... I called it smart and a lot of fun!
There is a place in Arizona called the Bear something, that has a lot of wild animals in it. I know guys from here that have gone there to capture animals. It's a fun and safe way to capture animals. And in many of those types of places, and perhaps like the one up by you, they are a refuge for animals or birds that would have died had they not been there.
So no, I would not call what you did cheating. Just state when you post where the photo came from and you should rest easy. Now if you posted say that photo of the snowy owl but instead of saying you captured it at the refuge, you said you captured it in 20 below zero weather after hiking 4 miles to get to a remote tree to find it, while getting frostbite on your nether regions.... that embellished report would be cheating I think.
I say, visit that place more often! It's not cheating to me. I think it's great photography because one could never tell these birds were in a cage.