The Wikipedia section you linked ends with

The report concludes that "exhaustive research of several government agencies failed to reveal even one conclusively documented case of 'brainwashing' of an American prisoner of war in Korea."

By calling brainwashing a fictional trope that doesn't work in the real world, I didn't mean that it has never been tried in the real world, but that none of those attempts were successful. Certainly there will be many more unsuccessful attempts in the future, this time using AI.