I agree. That sign is a usability fail. Does not specify that the receipt is presented to a specific officer. The phrasing leaves it to the traveller to choose the officer. Literally, it doesn't even say it has to be a CBSA officer. You could show it to a Mountie, or a Peel Regional Police officer. It should, for instance, put a big number or letter above the kiosk where this specific officer is, and say to go to that location to present the receipt. It also leaves it to the imagination what the purpose of this would be (i.e., is this about looking at your bag on the closed circuit TV?)
If they make announcements about it, that excludes me and another 4% of the population that can't hear it adequately, so the sign really should be self-contained.