I think it's plausible. That list of jobs was probably just a hyperbolic account of his student years. He may have studied CS, and then got a job somewhere, moved to WFH, and realised there he could cheat. You would get found out in a serious work environment but there are many places where you can get away with it.
ok so - hyperbolic means basically you shouldn't completely trust the Guardian in this story about someone you completely shouldn't trust. It has a nice symmetry to it I guess.
