The plural of your anecdote is not data that contradict the Gates' assertions. What is meant by 'population larger than the land can support'? The requirement '

The plural of your anecdote is not data that contradict the Gates' assertions. What is meant by 'population larger than the land can support'? The requirement 'land can support' is valid for communities which rely on subsistence farming. But the very fact that your caravan went there with food means that they have other sources than just 'land'. Now, if in a few years, when their population has critical mass, it becomes commercially feasible for a company to truck food there and sell it, then the problem is solved. So your anecdote, or even a systematic study of just subsistence-farming communities cannot be used to contradict the Gates' association.