Just seeing a lot of comments like "why did Jay leave the Road". This might help:
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A is where the track leaves the road. It's not visible here but from overhead it's quite wide and clear. The track heads towards B where another track leads to the building at C. The main track then zig zags back to another building at D, probably hidden in the dip before going another 500m past E and ending in what looks like a viewing point. Jays last ping was somewhere between A and B.
Observations:
1. These will be the first buildings Jay has seen since Masca, about a mile back. If he was at this point thirsty, it might make sense to pop down to see if he could ask for water.
2. In spite of what has been said, he was hardly in the back of beyond at this point. It was a modest ascent back to the road on wide track.
3. What happened next is crucial. Did he, finding the building empty go back to the road? Did he move on to the second building? Did he then, looking at the climb back up to the road, think "in for a penny" and carry on towards the sea?
4. Ironically if he had continued just 200m along the road Carizalles would have come into view.