The link literally says "There are three ways to make a living."
A job is one way to make a living, in which these ways may apply, but a job doesn't necessarily have to pay at all and can be entirely volunteer, if we're being pedantic. Jobs are often very bad ways to make a living these days.
It's an aphorism. I enjoyed it. It's not a proof of the Universe.
- Garbage collector, zoo keeper, lifeguard: As honest jobs, you can hopefully make a living doing these. To leverage these skills to become rich.. I don't know, but would imagine there might be some big lies along the way.
- Tennis player: How do they become rich, endorsements? Does associating yourself with a racket, shoe or energy drink count as telling truth or lying? Since ads aren't an analysis of the racket's technical properties, nor its contribution to your playing... I'd say it's lying.