A bird not flying outside it’s habitat is not delusion. Likewise any animal.
Just because there’s this modern idea that you need to travel and sample (trample on) everything, doesn’t make it more rational. Will going to Mars do anything for happiness? You haven’t been, you can’t know! That’s a fallacy, I’m not sure what, but it’s a fallacy because we know animals are adapted to their environment. We also are pretty good at knowing if we’re feeling alright.
You’re confusing scientism with reality. You can’t begin to claim to be right about some scientific thing without having explored a lot. But happiness can be found locally, in total ignorance. Your dog knows this. Only a human could confuse something like that through the curse of knowledge and modern culture.
What I will say is this man is rich. Not everyone, in fact almost no one, can afford to buy a farm in a beautiful area that’s surrounded by people and culture you like, with a temperate climate and natural beauty. He’s very lucky.