What's the point with that quite lackluster story in Endwalker?

[Lauront]

Yes, so there isn't a single piece of evidence that can be adduced that she told either her followers or their broader society about Meteion and there is no basis on which to categorically state that she did. In fact we know she did not want it to become common knowledge:

Venat: In spite of this, we cannot allow the report that set this calamity in motion to become common knowledge. Were the masses to learn the fates of the other stars, I fear the situation would spiral out of our control.

So even if I were to grant that she had shared it with her followers, we know there was no intention to do so with the broader society, or the Convocation, for that matter.