the reason professional hypnotherapists disagree with that is because they do not want to frighten people away from coming to see them and paying them exorbitant fees for hypnotherapy. there are cases where male hypnotherapists have been jailed for making female patients undress and sexual assault. these patients did not know it was happening at the time in an amnesiac trance and discovered later, in one case when the hypnotherapist had videod them, so hypnotherapists know its a lie to state otherwise.
I'm glad you put professional in quotes because there is NO official qualification for hypnotherapy.
anyone can take some hypnotherapy course advertised somewhere and call themdelves a hypnotherapist.
have a look at some advertised on the internet you can see its all about making money.