I'd say it rules those things in.
The authorities were said to have closed the area to visitors, tourists, that's why Yuri Yudin was effectively trespassing, and they warned the Mansi, who they probably didn't care about as news of any deaths would be unlikely to reach the outside world, not to drink from the streams or to let their animals do so, and maintained this advisement for 4 or more years.
All of which, against the backdrop of the Mansi males being taken ill around the time the Dyatlovs died, and the death of some of their deer, which were eaten by wolves (who later did not return to predate upon the hikers bodies, across weeks), may suggest an environmental event, and the common route it would tend to affect all these people and animals would usually be via the drinking water.
There'd be no need to close the area down if a snow slab slip or avalanche occurred (the official inquiry), at least not in summer, or to do so if Ivdelians had engaged in a cover-up over a tree collapse or after some KGB had decided to murder a group of people there when they'd hoped to stage it as hypothermia, indeed doing so would make it all the more suspicious. And a random event like a wolverine, stampeding deer or rutting elk would not require this overcautious approach either.
An argument could be made that had aliens or yeti been suspected then the authorities treated it like an Area 51, that is for those who believe is such esoterica, for which there is not a shred of evidence anywhere else.
It's interesting to take details like this and apply them to leading theories, I think, in order to roadtest them. It's why I keep returning to some sort of toxin, a medical emergency in the tent, heading to the ravine, taking cans of milk, and the authorities realising the danger and wishing to keep others away until it has passed or any further deaths of outsiders who never returned home would only alert people to what was going on there.