It’s been legal for a very long time in all states as far as I know. It’s why in nursing homes those who can’t even remember their name are allowed to vote.
How can this be legal anywhere? How can we have “assisted voting? A few years ago 20/20 or one of those shows did a whole story on “assisted communication.” It was similar to this assisted voting. Someone held a disabled, blind and mute persons hand and they miraculously typed whole poems and books. A few years later they figured out that it was a hoax, only after several states had been teaching it with grant money.