During my PhD, we learned that about 1 in 10 PhDs got a permanent academic position. That's intentional - the industry wants way more PhDs than the university. If we only trained future professors, we'd train many fewer.
But PhDs have low unemployment, even in subjects like history and philosophy, and the jobs they get in industry are usually good. So getting a PhD is not exactly the career suicide that people paint it as.
The author is right about the whole grant game though. Fuck that.