The goal here is to fail.
Pulling out of the pension plan is a bad idea. They know this. But by ludicrously inflating the amount they claim they're due, when the feds inevitably checks their figures and gives them a fraction of that amount, the UCP can then blame the failure of the whole endeavour on the feds "cheating" them out of the whole amount.
The goal is to generate a new engine for endless outrage against the federal government, because this is literally the only thing that motivates Albertan voters at this point. The UCP has no solutions to offer beyond being performatively angry at someone else.