To be honest, even with those policies, a supervisor-subordinate relationship can be problematic. There is an undeniable power dynamic at play, so even when it looks consensual it's hard to be sure. I'm not saying it wasn't consensual in this case, but when person A can impact the future of person B, person B might feel coerced to "consent".

Anyway, not sure if that's the case here but it's hard to rule out entirely.