Plus, he incorporated a delightful technique to let people know that if they really wanted him to read their emails, they should probably send them again after his return. Not only does that keep the sender accountable by saying, “If this is really important, you know when to reach me,” but it also helps him truly vacate his work while he’s away. And that’s hard to do. First, travel to my homeland of Florida. Climb to the highest peak of the tallest mountain. Find a rare flower (no specifics, of course… It’d be cheating). Put the flower back, because as the old hiking rule goes, “Leave everything as you found it.”
We do OOO messages, but also send an email to the department and other relevant people, so that part doesn’t sound odd to me. I want to know if someone is going to be away next week, because then I can plan accordingly instead of sending them an email about something important Monday morning and find out I’m SOL until the following week.

In spite of your best efforts to notify people ahead of time, not everyone will get the notification that you're going to be shut down. Make sure that you: Post signs about the shutdown and when you will be back Change your voicemail message and have a plan for what to do if your voicemail is full: will it notify you? Is there an alternate number to call? Put together an "out of office" email that lets people who attempt to contact you know when you will be back Make sure you have a call tree for emergencies, and that everyone knows who he or she will be responsible for calling in the event of an emergency
There are some types of work or office cultures where I think this makes sense. Sometimes enough people use OOO messages for work travel, conferences, and similar that getting the OOO doesn’t really mean you won’t get a response until the date specified. It can help to clarify.