And that handbook (which comes up in google search for me) describes shadow circle druids work. Afaik this 2ed is what BG1 was based on. It's in agreement with how Faldorn and the others were portrayed in BG1 & 2; while neutral in alignment, their actions would be considered both chaotic and evil by outsiders, as they followed the "survival of the fittest" philosophy and were strongly anti-civilization.
That sounds great, but that is more anarchoprimitivism and less isolationism if you ask me. A Shadow Druid circle would be burning villages, not hiding away behind bramble in a tiny corner of the world.