Here we go with yet another bit of information.
I don't usually post on these threads, but it's frustrating to see so many posters who aren't reading what's out there.
No one has ever said he was catching a bus.
He set out from the beach to go to the villa in Symi town.
The only way to get there was a) walking on the main road from Pedi, b) taking a bus from Pedi, c) walking over the track across the hills.
It appears from CCTV that he did c).