Thanks for explaining, that makes sense. To me, it seemed like a well-communicated coverage plan and I would have especially appreciated the setting of expectations on how soon I could expect a response so never would have even considered that to be condescending.
This OoO has to be in the tech sector. I can see something like this as an (internal only) OoO at my workplace. I actually kinda love it. Yes it’s wordy but it also makes the recipient take a beat and consider the importance of their issue and where to go if needed. It will also cut down on interruptions to the “catch-all” person in the standard OoO, which is generally the Admin. I have always hated being the go-to on people’s OoOs. I spent more time trying to find info on what Urgent Emailer insisted was URGENT than I did doing any actual work. And the urgency was never really necessary.

There’s a department at my workplace where this is common practice too. My old department worked with clients in similar ways, and I was half expecting we’d also be required to do it, but luckily that never happened. Further proof that, at this (generally progressive, flexible-working) company, your actual work-life balance heavily depends who manages you.
But I will be taking periodic breaks from eating, binge-watching, and probably from cooking, too, to check my email [once per day/every evening/occasionally] while I’m away.