That's great advice for normal fields without a massive oversupply of job candidates.

If you'll forgive a bit of 'splaining: In the academic humanities, the supermajority of newly minted PhDs will never get a tenure-track job. In history, only 27% of 2017 graduates had tenure-track jobs by four (!) years after completion of the PhD. This excellent thread by Megan McArdle explains both the problem and the solution (that most PhD-granting programs don't want to adopt, by the way) elegantly: https://twitter.com/asymmetricinfo/status/1564329262349524995?.

I had a friend who searched for academic jobs in the humanities for over five years and finally landed a tenure-track job. She was able to negotiate the salary UP to $44,000/year.

That's the backdrop for the complaints and desperation in humanities/arts academia. McArdle is correct to say that most students should be told not to start or finish the PhD. The reason that I, personally, am not perpetually filled with rage about this is that my undergrad professors did tell me what I was getting into. But many of my classmates in my PhD program had no clue about the stats and were fed optimistic falsehoods by the professors (who weren't really trying to be mendacious, but as humanities types couldn't imagine that there might ever be a quantitative answer to a question).