The series of tweets ended up being very specific about the location, that Phil was on the move, and that there was a cameraman with him.
Sounds legit to me.
And it may well be leg 10 because of the uncertainty about whether Copenhagen / Malmo was one leg or two. But the island theme seems to have been a more accurate guide in guessing where they were headed. It's also possible there was a leg we've missed after Malta and before Singapore because of the time element, and there are any of several new places that could be involved as a result. (My guess is that Phil is a day ahead of the Racers in Singapore, so perhaps an airport monitoring is in order?)