His income last year was around $60 billion, or $200 per person (of any age) in the United States. While last year was exceptional, all of his wealth ($600 per capita) was income in the last 20 or so years, most of it in the last 10. And his ex-wife Mackenzie Scott kept 25% of their combined wealth when they separated.
So it's simply not true that his contribution to GDP looks completely trivial even when compared to total US GDP.