I'm guessing here because I didn't see and hear it myself. I have two possibilities that come to mind. It might be that John is a person who is very focused.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
| up vote1down voteaccepted | Relevant terms suggested in the questions https://english.stackexchange.com/q/155385 and https://english.stackexchange.com/q/51451 include confined, insula |
In my own opinion. The meaning of Man o Focus is the person with a high concentration in one thing, so that He/She has an ability to be a very excellent in the action that He/she'e doing.