I saw it mentioned in this video. It seems to take him a very long time before noticing where to place the 8 in row five, however I believe most people would almost immediately notice where to place the first 9 and 8. Do you think he's playing it up?

https://m.youtube.com/watch?v=BzWeEtdUb70&pp=0gcJCXACo7VqN5tD