If he accepted money for work he did for them, he's never been employed by them? Yeah, right! Like if a woman accepts some cash from a guy after sex, she's not a whore. But freelancers do negotiate terms of pay before a service, so technically freelancers have been employed. He is more technically an employee, whereas a woman in my example is not a whore. You're right, they're not forthcoming on the facts.
You’ve heard of consultants right? They may work on client data but they are not employed by the client.
Do you send any of them a W2 at the end of the year? Do you pay a share of their taxes?
Then you are not their employer, and they are not your employee.