Well... do you think PG will have something to say that isn't already within these comments? Or do you just want to force him into responding with no other goal in mind?
HN isn't his inbox, after all. The discussion here is pretty interesting, and worth talking about -- that's why the topic has been voted up. But if PG (one of very many participants in HN) personally wants to write an updated statement about his views on investing in Kenya or other African countries that is primarily based on what's already being said here, that might be more appropriate for an essay (which takes time).
If he doesn't have any insight that adds to the discussion, I don't see why he should feel obliged to comment.
