The last half of his statement is especially invalid in roughly half of the world. Bill Gates isn't very strong, and he's more useful than any 'strongman' I've ever heard of.

See: Einstein, Newton, Aristotle, Tesla, Edison, Stephen Hawking et al. Brain has proven to be vastly more important and useful, than brawn, for thousands of years.

Bill Gates being particularly strong would not add anything to his overall value proposition, in fact I'd argue it's entirely irrelevant.