No, Saving Throws is not a skill or skill check.
Although you add your Dexterity modifier to the Reflex saving roll, it is your own mechanic separate from a standard Dexterity skill check or a Dexterity based skill check like Acrobatics.
These salvages test their ability to dodge area attacks and unexpected situations. Apply your Dexterity modifier to your Reflex saving throws.
Note that the wording simply says "Apply your Dexterity modifier"; if he said "Do a Skill check", he would have been subject to the armor verification penalty.
Additional evidence that they are courtesy separate from @Sdjz:
Apply your character's Dexterity modifier to:
- Ranges of ranged attack, including those for attacks made with bows, crossbows, throwing axes and many ranged spell attacks such as scorching rays or scorching light.
- Armor class (CA), provided the character can react to the attack.
- Saving shots reflexes, to avoid fireballs and other attacks that you can escape by moving quickly.
- Acrobatics, Deactivate device, Escape Artist, Fly, Ride, Sleight of Hand and Stealth.
As you can see, the skill checks you perform against Dexterity are listed separately from the point of throwing salvation, indicating that they are not the same.
Skill damage: Damage to your Skill score makes you penalize Skill-based skill checks, ranged attack attacks, initiative checks and Saving shots reflexes.