Okay, I actually skimmed the article and peeked at his blog. Thoughts as follows:
1. His career is totally portable. He can go back to work as much or as little as he wants, whenever he wants. Even if new licensing is required, with his experience, it should be a cakewalk.
2. Who moves to an entirely new place without doing any research?
3. I have a number of LDS friends and a deep, abiding respect for the way they live their lives. Utah is the center of their universe. They have big families. No, huge families. Their families have known each other for generations. Everyone knows everyone. I'm not saying they're unfriendly or unwelcoming, but they have busy, active, involved, committed lives. The LDS church is a central part of their existence, particularly in Utah. Expecting to go there and be embraced is a huge stretch. HUGE!
4. The best way to make new friends in a new place is to move to a place where a greater percentage of the people you interact with is also new. They are looking to make new friends and put down new roots, too. My parents moved into a brand-new Senior Community and their social life exploded.
5. Don't FIRE without a plan. Retire to something. I read the article and darned if I know what his plan was, other than to stop working. He seems to have forgotten (or overlooked for the purpose of selling an article) just what motivated him. Blaming the FIRE movement is disingenuous at best.
FYI - I'm six years post-FIRE and my life looks nothing like I planned, but I know how to make the best of things, count my blessings, enjoy life, and bloom where I'm fucking planted. Any and all of which skills would be helpful for him to master.
I agree that he didn't seem completely clueless, however his message was pretty well buried at the end. I strongly suspect a click-driven editor.