It's a good question, and I think the article's author unfortunately brings two different things together:

i) People who are intrinsically motivated to do good work, regardless of who it is for. Personality psychologists call this quality conscientiousness, and it's as predictive of good outcomes as intelligence.

ii) People who are willing to sacrifice all other aspects of their life in their employer's interest.

Hiring type i people is an admirable goal. Hiring and taking advantage of type ii people is not.