The mayor definitely has a negative tone. He's probably annoyed all eyes are on his sleepy little paradise and in a negative light. That Times article also has people arguing that what the mayor says isn't wholly accurate:
The mayor of Symi, Eleftherios Papakalodouka, described the area in the mountains as “very difficult to pass”. “There are two options — a road to Yialos or towards Agia Marina, but we don’t know which way he went,” he said. “There are only rocks, no shade, no trees. With 47 degrees heat you can’t survive.”
BUT Symi locals and a pair of British tourists, who have twice walked the route that Mosley is thought to have taken, have dismissed the idea that the terrain is treacherous. There are signs on the walk from Pedi beach to Agia Marina, and locals said they thought it would be hard to get lost. “It’s uneven under foot but it’s not treacherous,” said Jan Brownsort, 68.