Nevertheless, jQuery might support very vital business processes, saves the lifes of hundreds people a day (literally) or Incorporated in something which creates millions every second.
The most crap but working technology might be in places which earn money.
Using jQuery is not a career hazard, the web is html, css and javascript. I don't tell my clients that I do React, I tell them that I solve their business problems.
Others, like jQuery, might be in a much more precarious position. The point of the article is avoid these if you can.