After 100 days pass, all of the dark siders would commit suicide. The easiest way is to scale up from one dark sider. If there's only one, they'd instantly know that they are dark and kill themself. If we had more like two, then each could just say that the other one will realize it and commit suicide, once they don't commit suicide they both realize that they must be dark sided because of the fact that all other light siders could see both dark siders and the dark siders could see each other. Through induction, we could just say that for 100 people they'd all assume this process occurs for 100 days and after nobody kills themself they will all induce that they are a Darksider. (Sorry for the really bad explaination I honestly didn't have much of a clue with what I was doing :P)

As they will never tell each who is aligned to what side, and as that they can not know their own alignment without having to kill themselves and due to the CSP member not being specific as to whom they refer in their statement. Finally since asking for clarification on who the csp member speaks of would break the custom as to not discuss the force. No one in the tribe kills themselves due to this statement as they all know there are dark siders in the tribe and a singular individual was not specifically pointed out. However it is also possible to keep with their traditions they would inform the CSP member that they must kill themselves the next day or attempt to force the csp member to do so.

in conclusion, no tribe member dies as individual(s) was(where) not named, all tribe members already know dark siders are among them. CSP member might be forced to commit suicide the next day for breaking the taboo of talking about the Force.

After mentioning the force in his address, Wagglehorn continues his speech. The speech ends, and the feasting begins. Wagglehorn passes out sometime around 2AM.

Waking up shortly before noon the next day, Wagglehorn wakes to a crowd gathered in the center of town.

He asks what is going on, and is told that the entire village is now lining up for the ritual that begins at high noon. Pressed for details, it is revealed that the entire tribe has discovered their own alignment after the conversation topic was breached by Wagglehorn the prior night. Between the flowing alcohol, and the newfound freedom of thought inspired by Wagglehorn’s mention of the force, (also, possibly a fear of the dark side), the tribe all looked inward and discovered their alignments.

Bound by cultural rigidity, the tribe does what they know they must.

Wagglehorn frantically tries to dissuade the crowd from continuing their ritual. High noon hits. 900 light sided and honorable TRF tribe members become one with the force.

The remaining 100, who never intended to follow through, are now in control of the village’s resources and negotiate an alliance with Wagglehorn.
Dumbfounded, Wagglehorn returns to the fleet with a newfound alliance among a TRF tribe, though an admittedly smaller tribe than intel originally indicated.

The one person addressed will commit suicide.

The others, while able to feel other people's alignment, are still unaware of their own alignment. Since discussion and further inquiry are still prohibited, there will be no further exchange about the issue. They will observe that the CSP envoy is a darksider, but aside from concluding that CSP apparently shares the alignment of the tribe's minority and a plea to not disturb the customs further, nothing will come of it, again because discussion is prohibited.

Of course, nothing stops the envoy of then intentionally pointing out a few lightsiders before he's kicked out...

By winning their trust, that in part means they expect you to commit suicide at noon for knowing you're own alignment. The people don't know their own and they can't know who the CSP member is referring to. what is clear is that the CSP member knows his own alignment. so the day will progress with the people expecting the member to commit suicide the next day. Realizing then as the member leaves or stays but doesn't seem to be preparing for suicide, the people of the village force him to (or at least try)