Andor's Trail

Does Gandoren acknowledge the update on the illness issue after successful completion of the 'flows through the veins' quest?

I think Gandoren did speak something in my previous playthrough when I revisit him after completing the 'flows...' quest.

This time neither he nor the dialogues of Loneford people reflect any changes after killing and reporting back to Kuldan and complete the quest.

Is there anything Gandoren comments post-veins quest?

I don't find any different reaction of Gandoren after completion of the Loneford quest.

And although the quest is completed, I wouldn't expect the people to change their opinion about the source of the deaths. They say what they believe, and won't change their minds just because of some foreign child's tales...
So I don't see the need to change the dialogues. (which also would be a rather complex and error-prone work)