If it’s something as simple as they used the water from Lake Nostos to bring back his lost soul, they could cover that in a couple of lines of dialogue if they intend to use the same water to heal Nealfire.
It’d be nice to see a scene of Phillip actually waking up though, because it would be a nice mirror to the scene where he was the one waking up Aurora, (especially if it’s shown in the season premiere).