Several diverse observations:
1. The Tour de France point of departure for Tuesday July 10 was Wagerem, 10 miles southwest of Ghent. Although it was possible for teams to be seen around town in the early morning, they would have left for the start line by maybe 9am. I doubt that the travelers would have seen them in Ghent the morning of July 10. It had to be July 9 when they were actually finishing in Ghent. Getting a good spot there and waiting for the race to finish would have required the 5 hours mentioned in their blog.
2. I have given more thought to the question of when the race might have started. In order for teams to be seen in Belize on July 5, they would have started no earlier than July 3, which is consistent with prior information. An alternate theory is that they started July 2 and went somewhere else first. The list of such places would include anywhere you can easily fly to Belize City to or take a bus from. That would include all of the Mayan Riveria form Cancun down, Cozumel, Chetumal, Guatemala City, Tikal, San Pedro Sula, Tegucigalpa, La Ceiba, and San Salvador.
3. I like Chateau's theory that San Salvador might be the next destination after Belize City. There are nonstop flights from San Salvador to Los Angeles as he indicated. The other possibility is that teams get to northwest Mexico, one of the cities indicated in my SPECULATION thread posts. This appeals to me because I have a hard time believing that they are going to send teams from the middle of Central America northwest to Los Angeles and then northeast to Ireland, about 8000 miles of flying all in one 24 hour period.