This all came up in the mid to late 1990's.
Sure it didn't get tons of press, but it the information was out there that the state pension system was overly generous in their promises and benefits and that they were using assumptions that would be CRIMINAL in any private settings. Also, another problem was the pension board would make changes to the system that almost always meant larger payouts to retirees, and these changes were not negotiated during contract talks, but just "because", and even so, these changes were one-way ratchets. The pension board could not undo any of these free "gifts", no matter how poor the original reasoning behind the decision.
It is really quite an insane system. And there were folks in the 1990's who I read who predicted that what you see now would happen. It is not a mystery or surprise. Those part of the system have known about this ticking time bomb all along.