There are rules laid out in a Kreisschreiben. And I paste for you in German:
And translated
Hence, he is NOT on the safe side, but fulfills 4 out of 5. A deeper analysis would be necessary.
He is not︈ working and only holdig 1 type of asset that is being sold annually for living︉ expenses, in the same way as you pull money from a savings account. Given the︊ fact, that X spends most of his days laying on the beach/snow and (this is︋ important) is not engaged in any way professionally at any invested company/etc., it is not︌ a professional activity. The matter would be deemed differently if X was working as CXO︍ for an invested company.
If you want to be sure, you can apply for a︎ private letter ruling. But this case seems pretty clear to me. Call the Zürich Tax️ Office on Monday, they will give you their 2 cents free of charge.