Yes, certainly.
In fact, this amendment is inconsistent with the agreement. It's inconsistent with article VI, paragraphs 10(f) and 20(g). They specify that in the pre-clearance area and perimeter, pre-clearance officers respectively shall be authorized to detain not just travellers, but any person who is believed to have committed an offence under host party law.
That enables the pre-clearance officer to detain a person and transfer them to Canadian authorities. For example, requiring that offences be connected only to travel might mean that a pre-clearance officer would not be able to address a suspected offence, such as aggravated assault or murder, which may not be connected to the individual's travel through pre-clearance. If they didn't have this authority, they could not refer that person to Canadian authorities.