People think Geomancer is a healer because healers are desperate for another healer class. That and Kyokohu uses placeholder conjurer animations in the quest. But other than that one animation (reminder, placeholder) nothing in the 14 story has a Geo healer, just casters.

Also Conjurer story does work for Geomancer lore considering the 1.0 datamining found Geomancer as a branch off of conjurer. So it was intended, just not implemented. Plus the feng shui roots approach is going to be so much better than healing the Twelveswood.