There never has been a shortage of ab-initio frozen ATPL qualified pilots, amd there never will be. Such shortages as have ever existed were always for type rated pilots with significant hours. The market certainly has peaks and troughs, but there has never been (and will never be) a time when all those who'd like to fly airliners for a living will succeed.
Remember, all flying schools rely on your custom for their survival. If they can persuade you that your investment is 'guaranteed' to make a return, they get your money and they get to exist for a little longer - hopefully making a profit in the process. Throughout the recent difficulties, most schools have been trumpeting a future shortage of pilots. In fact, come to think of it, they've been doing that at least since I started flying in the mid 1970s.
Treat all such articles as little better than marketing-speak. Read your aviation history and make a more balanced judgement of the realities of life.
Scroggs