One researcher was at UQAM, the other was at UQTR. Are both not considered part of UQ?

No, both are separate universities, although some universities also have satelite campuses (UDeM (montreal) has multiple).

Edit0: Although UQ is a group of 10 universities that are public, they are not a single entity.

	▲	dcrazy 2 hours ago \| parent [-]
		That sounds like the UC or SUNY systems. UCSB, UCLA, etc are all separate institutions with separate missions, but it’s totally normal to say “UC Berkeley” or “UC Santa Cruz.”