Aside from the obvious possibility that this "guarantee" can disappear every time that our collective bargaining agreement is renegotiated, we also need to be leery of the Kline-Miller Multiemployer Pension Reform Act and it's provisions that could allow UPS to challenge their contractual obligations if any cuts do not follow a strict script.
UPS spent an enormous amount of money lobbying in the months and years leading up to the implementation of this legislation, shaping much of the language within, before it was whisked through as a result of being attached to the Omnibus Budget Bill of 2015, in late 2014.
I won't count on having my pension as it's advertised until the ink is dry on my retirement papers and Central States is inevitably deemed completely insolvent.
Make no mistake, UPS is desperately looking for a way out of this guarantee, as they never imagined the huge liability attached after paying the $6 billion plus withdraw liability, a sum they sure figured would stretch Central States out until most of us with skin in the game died off.
~Bbbl~™