Yes they are. I generally have a sort of side rule that for crafting Talents you need at least a Dex of 4 to use them efficiently. This is just for Craft Talents though, not things like Herb-Craft or anything not described specifically as a Crafting Talent. (Crafting Talents are Blacksmithing, Carpentry, Tailoring, Stone-Cutting, and Leather working) 

But yea, Craft Talents are Aptitude, not Dexterity.