Wish one of the new bosses in the current alliance raid had its own theme (spoilers)

[Iscah]

The game treats everything as canon and done before (to an extent). Which is why Louisoix could appear. Krile and G'raha Tia are there, neither of whom met Louisuix. So the Coil stuff could easily be an extra line or two if you've done them, else you don't get that dialogue.

That is not how it works. If a sidequest changes the state that a character is in, then the MSQ alters dialogue to reflect the current state of affairs. If it cannot be covered with dialogue, it gets left out.

If a player has not done Binding Coil, there is a long-standing precedent that Alisaie's comments change to reflect our current completion state. If we left it unfinished, she says it is unfinished. If it's unfinished, then Louisoix's soul cannot be found in the Lifestream.