The first post about this “treatment” was published by human rights activist Fiona O’Leary on her Tumblr, here: SPOT! New Quack Treatment!
A Hungarian quack called Zoltán “Sági” Tóth, along with his two Hungarian associates, is selling a “cure” for autism.
His English is horrible, so I did not really come across what his “mental training” is really all about. Fortunately for us, he was also questioned about it in his native language and his answers are more telling. The whole chat has been published here in Hungarian, and here are the relevant details.
Based on his reactions and quotes, he is very likely a Scientologist.
Here are some of the things he said (explaining how his “reaction-based mental training” works). He basically states that autism is caused by an unresolved trauma, and by having the person repeatedly talk about the trauma would discharge it and autism would disappear.