Earlier quoted context omitted.
No, he's not. https://www.troyhunt.com/about/ says "I don't work for Microsoft"
"Microsoft Regional Director" We can debate semantics but if you describe yourself with a job title attached to a company then I suggest that you have an association which looks rather like ... employment.
Extending your logic, I have a CCIE, so if I ever state I'm a CCIE, I'm an employee of Cisco? I have a masters degree by coursework from a university, so I I ever state I have an Msc, I'm an employee of the university? I have an electrical licences issued by EnergySafe Victoria, so if I say I'm an A-Grade Electrician, I'm an employee of EnergySafe Victoria?