I personally like it. Of course, the emails that I’ve seen still say what to do if the matter is urgent and needs to be handled now — but as a person who gets 100+ emails a day, whether I tell you I’m deleting all of them when I get back or not — if it is in the thousands of emails that might accumulate in the time I am off, I’m not going to see it or respond. Better that I tell you now that you are going to have to resend the email after I return (or get my backup to handle it now) than you sit around waiting for a response that is never going to come. It is actually pretty common in my industry for any absence two weeks or more.
A. Nearly all offices will be closed on Main Campus during winter break; therefore, each department should ensure their telephone messages and out-of-office email replies reflect that their office is closed but resuming normal business hours after New Year's Day. They may also want to note their winter break closure on their webpage.

About the “overshares”: You linked to a previous column that mentioned this point, “Sometimes the over-sharing of plans can even come across as suspect — similar to how when someone’s calling in sick with genuine illness, they usually just say, ‘I’m going to be out sick,’ but fakers will generally give you a long list of overly specific symptoms, like they feel they have to convince you.”
“I’m offline and have sporadic access to email until X date. For urgent matters contact Colleagues A and B. For true work related emergencies you can call me at Cell Number”