The article fails to compare Computer Science PhD's who are in high demand and job openings for them far exceed the supply of CS PhD grads.
Of course, there are plenty of job openings that ask for PhDs, but most of the work does not truly require a PhD. Those jobs are filtering out the vast majority of capable candidates while targeting people who have already shown that they would prefer a different sort of work by doing the PhD in the first place. Is it a surprise that they can't fill the position?
Does that mean that CS PhDs can easily get jobs? Perhaps.
Does it mean they can easily get interesting jobs? I am more doubtful.
Does it mean that producing more PhDs is necessary or even useful? I doubt it.