He just finds it very peaceful and thrilling. "Just him and the climb" kind of language.
Also I suppose clout has to be involved: only person to free solo El Capitan, as far as I know the only person to climb Taipei 101 let alone free solo (did the spiderman guy ever make it or was he arrested?)
For a deeper dive, the book "Alone on the wall" is a good read and I recommend it. https://www.goodreads.com/book/show/36531127-alone-on-the-wa..., although that said the book might be less appealing to someone who 'knows nothing about climbing' and is more of a time investment than the short documentary :)
But it's certainly time we admit everyone feels feelings diferently. Even something basal like pain experience is hugely individual with large variation.