Yes, Noah's secret was revealed early in this episode, and yes, this episode is excellent, and its only problem is that it is the fourth episode.
The story is excellent, the execution is more than wonderful, and the feelings are real. Everything about this episode is excellent, except for the fact that this episode should have been near the end of the season.
The reason that this episode will not be appreciated is because the viewer has not yet been associated with the characters.
The viewer has not yet fallen in love with Noah, Holliday or Six, so he will hardly care what happens to them, and even if he does, it will not have the desired result.
The only solution to this problem is to switch watching this episode with an episode like Episode 20 titled Badlands.