I agree that that it really isn't that much of a spoiler. Anyone coming in with knowledge of Shadowbringers (and knowledge that Endwalker is the conclusion of the Hydaelyn/Zodiark storyline) won't be surprised to learn that a battle of some kind takes place at the mothercrystal.

Also, where exactly does the trial name exist ingame that is going to spoil newer players? You can't actually see a partyfinder listing until you've unlocked the fight that the PF is for for example.