I don't believe the instructions are that explicit. They say you do not have to declare same day absences, which is quite different from "do not declare". I went with the view that if I declared the day trips (I had two or three in total), my residence calculation dates aligned exactly with my CBSA report entry dates. It just provides further accountability of my residence. Also, if you get RQ you are asked for all absences from Canada including day trips anyway.