I don't know, but SIE has a headquarter there so I assume he'll visit it maybe at least once per year and may work normally from UK, next to his home.
But who knows, considering that he makes the webcasts streams from his home for the fiscal reports maybe he doesn't even goes to Japan once per year. I have no idea.
Really funny, but it's his personal account. And MS is a big partner for his company, publicly mocking them with a sensitive topic may get him fired. He may have a boss that knows about Japanese culture (he may even be an expert)