Sometimes this may be the case but not so much here. Firstly the mention the version they used and, secondly, OtterTune are a startup based around automatic DB

Sometimes this may be the case but not so much here. Firstly the mention the version they used and, secondly, OtterTune are a startup based around automatic DB steup/schema optimization founded by folks from CMUs DB group, they most certainly know what they are talking about here.