I've certainly seen "most" used to mean "almost all", and it appears as though you're feeling a little annoyed to see it used that way because you consider it misleading.
I've also frequently seen "most" used to mean "a majority", though, in which case GP's use of the term is precisely consistent with the facts in their source.
So if you want to be as close as possible to as many people as possible, somewhere in Myanmar would be a better choice than London.
Of course the calculus changes if you also consider how much money each of these people has access to.