Yes, I suspect that will help connect the dots and explain what he's doing with those shipwrecked people in the first place.
I don't necessarily agree that the viewer should know right away what is going on. When you meet a stranger, without any context, you don't immediately try to figure out...is this person good or evil? You have other questions about who they are and what they are up to. An encounter in Faerie is a bit different, where magic can be dangerous, so you want to know right away what your risk is. But it's still not always clear. Many beings are encountered in George MacDonald's Phantastes and Lilith. The books are very much about goodness and evil. And yet...it is not always clear right away. Sometimes, the protagonist finds out the hard way, or someone's true nature is only revealed by external events (ie, see them in moonlight for the first time). It can be frustrating not to know right away, but that is how the story is told.
For Rings of Power, it did feel as though they were playing a game with the viewer. Sure, can you spot Sauron? But also, can you tell if someone is good or evil? Galadriel, of course, should be good. But is she? The Stranger, trying to figure out if he is a peril to the Harfoots...he might be 'good', but he sure did kill those fireflies. With Halbrand, he said some rather dark things all along, sure. But, is he someone with darkness in his past trying to be better, someone who is callous and jaded, or someone with evil intent? I would not say that the truth of the matter was obvious, and I do think he was letting Galadriel see what she wanted to see. That does not mean that the narration lied. Allowing for obfuscation as the characters only gradually learn the truth is a device of storytelling...and dragging out the reveal for too long can be frustrating. It's a trick to induce the correct level of anticipation and curiosity in viewers without dragging it out into frustration. The framing device of How I Met Your Mother refuses to reveal who the children's mother is for a VERY long time - it's a gimmick, designed to frustrate viewers.
Now that Rings of Power is past that reveal, they can tell their story without playing the "who is Sauron?" game. The viewers will know who Celebrimbor is working with if Annatar returns to Eregion to make more Rings. We may learn that he was already in Lindon before Season 1 began. Etc.