The Soldier's "Devastating Throw" Gear Boost seem to have it's attributes the wrong way round. Soldiers cannot throw weapons with Dexterity (Thrown attacks are Strength-based and the Operative weapon special property only applies to melee attacks). In general no class can use Dexterity instead of Strength for thrown attacks. Making the bonus for having higher Strength impossible to use and even if it was possible there would be no reason to choose to use Dexterity over the default Strength.
However if the attributes were switched this Gear Boost makes a lot more sense. It would allow Dexterity-based Soldiers to take advantage of thrown weapons they previously couldn't have meaningful used.