Pensions-unrecognized acturial losses and PSC

In pg 112 of schweser, why do we add Unrecognized PSC and acturial losses to the the funded status, thereby making it less -ve. Aren’t these liabilities that need to be paid?

topic has been addressed plenty of times - losses are added and gains are subtracted. Note “to add” means losses make the liability closer to zero, and the asset farther from zero.