The bones were found in a very strange location "the last place you'd look" and it didn't make sense why he'd end up there - the video provides (during a walk to where the remains were found) about "how would an experienced hiker end up like this" and basically lays out how each step of the journey "made sense" and the last attempt was based on a relatively low detail map - he was heading cross-country to try to get to a road in the shortest distance possible.
It also drives home how you should not deviate from planned travel and always try to back track, but I digress.