It is a strong statement. But as far as I can tell it's a true one. As far as I'm aware there's no SE Asian country that has a democratic government that we in the west would consider acceptable. I could be wrong - there are a lot of countries there and I'm not familiar with all of them.
My apologies for the sweeping statements. It's a complex subject and a HN post doesn't give room to explore the topic fully. I totally agree that this is a bit stereotypical. But it is based on my actual experiences in the region over the past few years. I have no idea whether more time there would change my opinion or reinforce it.