THANK you. So much. As a US citizen, the reasons for not releasing suicide information is not obvious at all. Depending on jurisdiction, suicide can be mentioned by LE even before an autopsy. Where I live (California) and in most US states, a coroner's report is a public record and can be purchased from the relevant county.
If hypothermia, people can be found together (rare) if they believe they have to stay in one spot. So people die in Yosemite of hypothermia because both are afraid to walk a trail in the dark or both are afraid to trust their equipment in the dark (etc). Or, in the case of one pair, it seems likely that one of them could not have managed a self-rescue, but the other could have (and stayed with his partner).
People huddle together for warmth and if found together, that is usually telling. Not every hypothermic person disrobes, by any means, and not all hypothermic people are aware that their body temperature is dropping (same is true for hyperthermia).
They were close enough to the river to sneak there in the dark to drink, IMO. If they still had a gun, then murder-suicide or suicide-suicide is a possibility. Or if they had lethal drugs (or simply adequate amounts of a soporific). Alcohol works just fine and that's a common method of death-by-cold in Russia.
So, I guess coroner's reports are not available through PI requests from media in Canada. Fascinating to me. The families may speak (and I would assume that the victims' families would have this information - but I could be wrong about that too).