It's just another attempt to take the risk that the employer has agreed to take on, willingly and freely, and shift it to the pensioners.
It would make the math easier, but the elephant in the room on the math is that these same claims that have been made today were made in 2005 on WEPP. If you can't provide data that shows some armageddon occurred because of WEPP, then I don't know how you can accept there will be a problem with this. That's math.