Yes and no. The v3.0.0 update itself is free for all Pokémon Violet owners. It contains:

Pokemon Violet Version 3.0.0 represents the definitive peak of the Generation IX experience, specifically identified by the Title ID 01008F6008C5E000. This massive update integrates the full "Hidden Treasure of Area Zero" DLC suite, bringing together the base game, The Teal Mask, and The Indigo Disk into one seamless package.