This is true! The nuclear option also helps the recently returned vacationer understand what is a priority and what isn’t. But, as boyd wrote, “if you just turn off your email with no warning, you're bound to piss off your friends, family, colleagues, and clients.” The blog post offers some helpful steps to make a clean break feasible — they include communicating with colleagues about the sabbatical long in advance, managing expectations of those who rely on you, creating a backdoor for true emergencies, and then, right before going away, reminding everyone about the sabbatical once again.
I don’t think OP meant condescending to the person’s teammates so much as condescending to the reader. The person over-explains each option and I can see how it would read as ‘wow, you are really dumb and obviously need some handholding to figure out simple decision-making!’ That likely wasn’t the intent, I understand, but I get why people might take it that way.

Thank you for your message! I'm out of the office from X DATE to Y DATE and will not be checking email. I'll follow up with you as soon as possible upon my return. If you have an urgent request, please contact XX person at YY email address.
Sorry I missed you — I’m unable to get to my email right this second. Why? I’m on a backpacking trip, surviving on Spam, really good water, and trail mix. You should see the stars out here.