That is interesting. I have never heard of the dementia provision (found here: https://www.compassionandchoices.org/userfiles/Dementia-Provision-2014.pdf) and I wonder if it would stand up legally. Perhaps so, because it only applies to a situation where "I am consistently and permanently unable to communicate, swallow food and water safely, care for myself and recognize my family and other people, and it is very unlikely that my condition will substantially improve,..." Consistently and permanently unable to swallow food and water safely is a very advanced stage; the main thing this prevents is the person getting a feeding tube at that stage, which is a medical treatment which can be refused.