It's an interesting article though the headline is a bit of a misnomer, as some of these shows were actually hits in their original runs (ie shows which recouped their investments), which went on to become bigger hits when revived, or flops (ie shows which lost money for their investors) which went on to become smaller flops.
Thank you for pointing this out!
Also,
(“Flop” is a technical term for a show with a relatively short run that doesn’t make its investment back—and not necessarily meant as a reflection of the artistry of a given work.)
I honestly had no idea, I thought it also got used as "shows that were bad" at least colloquially.