If I had a hiring manager say this to me in an interview, I would not want to work for that manager. Random interests outside of work have zero influence on a candidate's ability to perform a job well. I enjoy working with coworkers who live fulfilling lives outside their 9-5, but outside of illegal activity, I wouldn't let their outside life influence my decision to hire them. If they find value in playing video games every hour outside work, that's fine. If they want to obtain random certs and skills, that's fine too.
I'm also in the process of getting my private pilot's license. Do you expect me to start flying in the middle of the day instead of working? If anything, being able to focus on a target goal that can take 6+ months to accomplish indicate focus and drive more than a lack of it.
The SCUBA diving example mentioned is an interesting life experience for someone to have, and doesn't deserve someone gatekeeping whether or not the individual is "serious" about their hobbies or experiences.