Probably not common, but certainly plausible. Not everyone wants to bring work home or have hobbies that are the same as their work.
Tells you they are an extremely competent smart worker that could be surprisingly helpful in ways we don't understand.
I'd love to learn from such a person.
I knew one software developer who basically spent all his free time outside hiking and camping and rarely did anything with a computer when not working. He was a good dev and very competent. Just after being cooped up inside on a computer all week he didn’t want to spend more time on one at home.
It’s not much of a stretch beyond that to simply not owning one.