I noticed that the Decapitation mission has the Designated Target rule, but its HVT and Classified Deck not used paragraph explicitly prevents placing a HVT model at all. I presume that just the Classified deck isn't used, otherwise the HVT-as-designated target is never placed and the maximum points either player can score is 5.
correct. It's a mistake.you have to change this :" HVT AND CLASSIFIED DECK NOT USED " for "CLASSIFIED DECK NOT USED"