In their defense, board seats are not a full time job. The commitment could be as little as a few hours a month or quarter. “Partner” could also mean quite a few things, such as a partner at a venture firm for example. Which also may not be a full time job.

The difference here is that as an employee you commit to provide 40 hours of service to your employer. From the stories I’ve heard of these double jobs, this isn’t a weekend job working at the local coffee shop for an extra few bucks which doesn’t impact your primary responsibilities. Instead it’s a professional job with overlapping hours. Which means an employer isn’t getting what they paid for and these people are deceiving them.