I don't see anywhere where he is calling for application logic. He's making sure that the data has integrity, and the database absolutely should be in charge of

I don't see anywhere where he is calling for application logic. He's making sure that the data has integrity, and the database absolutely should be in charge of that. If your database can't enforce integrity, then you're in a very, very bad place. Putting in sane integrity checks to a database should be a priority. You can fix broken applications, but you can't fix broken data (especially if you collected it from users, sensors).