The definition of Mentalism says it is a performing art in which the mentalists appear to demonstrate high mental or intuitive abilities. This includes claivoyant, mind control, hypnosis, telepathy, precognition etc.
I would disagree that hypnosis is classified as mentalism. This is because mentalism is the creation of false realities, to let tbe audience in awe, admiring the great abilities of the mentalist.
Hypnosis though is also stage performance with some entertainment values, it is however not false realities. It is demonstratin of true mind power that resides in each person.