TLDR: It isn't true. Just some early morning ramblings, but I feel like this is an important reminder regardless.

I think it'd be more accurate to say "Hypnosis can't make you do anything you're not comfortable doing." Because "want" and "comfort" are two very different things.

If you are used to something, then it's very easy for a tist to make you do it even if you don't want to. Speaking from experience here. A former long-term tist of mine would often take me saying "I don't feel like doing hypno tonight" or "I'm not in the right headspace for hypnosis rn" as a challenge, and she'd usually win that fight. It's not that I wanted to be hypnotized -- I was emotionally a lil numb and unsteady in those moments, I really needed some isolated down time, and having my will taken away wasn't what I wanted. But it's something I was trained into over time -- my body and mind were used to being entranced, were comfortable with sliding into trance.

A good tist -- especially a long-term tist -- knows how to push their sub's buttons, for better or worse. In NSFW hypno especially, because of the BDSM dynamics, tists can be good at manipulation tactics (again, for better or worse). So please, on both sides, drop responsibly.

(And if me saying "drop" actually did drop anyone, please wake up, thank you. :p)