I think there might be room for misreading/misinterpretation of that part. I read that part of the review as saying complex societies have 'bucked the trend' b

I think there might be room for misreading/misinterpretation of that part. I read that part of the review as saying complex societies have 'bucked the trend' by not being -as- prone to collapse; but with a big caveat that it looks like complex societies may operate on longer time scales, so the collapse might be staved off for longer. It's an open question about what 'long enough' would look like though, one that's probably beyond the author's scope.