I think the question the court was trying to answer was "did he act negligently?". If he did, he's responsible for the result. That he didn't bring a first aid kit is further evidence that he wasn't prepared for the hike, so I think it's relevant.
Yet it would make no difference in this scenario. He brought a bunch of other equipment, like camping gear and the recommended amount of water for the time he expected to be on a beginner trail. That seems to be equally relevant, if not more so since those are things he actually used.