Does a “Thief Racket” Rogue gain an ability score boost to Dexterity at creation?

At character creation, the rogue class says under Key Ability : Dexterity or Other At 1st level, your class gives you an ability boost to Dexterity or an option from rogue’s racket.

Now, the thief racket allows such a rogue to use dexterity to deal damage with finesse weapons, and my interpretation was that such ability replaced the ability boost (which seemed balanced at first; a Thief would use Dexterity for hit/damage and AC after all, letting the character concentrate on a single ability score without being a caster). But recently I’ve seen the iconic rogue character sheet, and it seems that, as a thief rogue, the character’s Dexterity was 18+. So that’s it, is the iconic character sheet wrong? Or does the thief rogue keep the Dexterity ability boost?