Regarding your second point, I agree with you. I'm concerned that this doesn't necessarily speak to the capacity issue that proposed paragraph 153.1(3)(b) speaks to.
That raises a number of different points about your first question, which is that the law on when a person is so incapacitated that no consent is obtained in law is complex. The case law is difficult and there may be a number of different factors that are relevant. Singling out two factors, one of which may not relate to capacity, may have some unintended effects. As to what those effects could be, I cannot speculate, but I just point out that it is a complex issue of law, this particular paragraph, proposed paragraph 273.1(2)(b).