I looked at the links in your article. That is a barred owl according to the photo linked to the news story/webpage.
Like most other raptors, the male owl can be 2/3 the size of a female. So, it can appear to be an immature bird. Having seen these owls here in Northeast Ohio, I can tell you that the male of this species looks more compact than a female - especially in height.
There is a park here in NE Ohio where hikers were also attacked by a male barred owl a couple of years ago. There was a nest nearby. The owl would dive-bomb people who passed by the area. In particular, the male didn't like one hiker's red baseball cap.
I used to participate in a raptor nest survey. Owl nests are very difficult to find because they used cavities in trees. So, unless you see one go in or come out, you may never find the nest. I was VERY lucky one year to have spotted a barred owl going into a large hole in a tree. It was really great to go there in the very early morning to watch the owls. And, at that nest, the male perched about six feet off the ground. I would pass right by him when I was on my way to the area that gave me the best view of the tree with the cavity. So, in this case, the male was very accommodating towards me. I would talk to it as I passed it by. The female would always be perched on or near the nest tree. It would often glance down at me. I never felt like the owls were bothered by me. I do believe they understood that I was no threat to them. And, even when the three young owls came out of the nest, the adults were never aggressive towards me.
Great horned owls are an exception to this. They often nest on top of large broken off trees or use old hawk nests. What is fascinating about these owls is that, they will start pairing up and nesting in December and January. They will use a hawk nest, raise their young, and leave the area. Then, later in the spring, a hawk will use the same nest.
I have also watch other raptor nests: screech owls, Cooper's hawks, red-tailed hawks, red-shouldered hawks, broad-winged hawks. I can tell you that each adult hawk is different. Some were extremely tolerant of me. Some would start screaming when I was a long distance away from a nest. I always learned where the hawks'/owls' comfort zone was. And, I kept a respectable distance to the nests at all time. Birds are vulnerable when they nest.
One more thing: Wildlife today is being forced to deal with human development. So, wildlife-human encounters are going to happen. The wildlife has no where else to go. So, some species will adapt and some will not. A good book about this subject is "Welcome to Subirdia" by John M. Marzluff. (The link to a vendor is purely to learn more about the book, not a recommendation as to where to purchase it.) It covers more than just birds. It uses a lot of current research studies. Highly recommended.