Close, but it's "Butlerian". Easy to remember if you know it's named after Samuel Butler.

https://en.wikipedia.org/wiki/Erewhon

That was one of the most unplausible aspects of that series, at least the subset of which was remotely plausible - i.e. there was alot of "magic".

Given two factions at war, one of which is using AI/machines and the other is not and wants to destroy them, my bet is on the side using AI/machines.

The alternative is far far worse.