By completing these items, you alleviate any concerns that may arise during your closure. This also ensures your business continues providing transparency to your customers. No misunderstandings.
I absolutely hate this and it would definitely irritate me if received. I agree with the letter writer that it comes over as condescending and also a bit passive agressive in places. I’m definitely not the audience for this one! Presumably this is an internal only version and the company culture would find this cute / funny.

I have been out the office working from home for more than a year now. After a few weeks of remotely checking VM (and sometimes forgetting for days) I simply changed my phone setting so you cannot leave a message. I have not regretted since. On very few occasions people have clicked 0 and gone to reception. Reception can IM me and ill call or email the person back if I want or they can give them my email. Everyone else either emails me or if they already have it call my cell. Internal people never call my phone they use IM or video chat. No one internally has had an issue with this and this eliminates the whole hey call me back to spend 30 minutes talking about something that I could have answered in 2 minutes in an email.
Just because I’m that person, I may have actually contacted you with a “Hope you’re having a great time!”