I think you're overlooking a more likely (and more reasonable) approach preppers take; become skilled in various survival-oriented skills and then if things go south you can go to one of those farms and offer to help out in exchange for some of the food. The lone rambo raider types aren't going to last long, humans are social animals that do best in tribes and for the most part want to form tribes.
Preemptively apocalypsing yourself by forcing yourself to live in some sort of self-sufficient compound right now isn't reasonable for most people, but having some plans and resources in your back pocket in case of disaster is not at all unreasonable.
If nothing else, it makes camping more fun and lets you ride out a power outage or local disaster in style.
Ooh. As a hobbyist "mostly for funzies" prepper I was mildly interested. But then I clicked around their site a bit and I found preorders for a version of the prepper disk with an LLM chatbot "companion.". Assuming the LLM is using RAG on the library of source documents and isn't just relying on its training, that's really neat. I know people will exclaim "hallucination!", but in a situation where you literally have no idea what to do, no way to get help, and the alternative is lying down and dying, I could see this being really handy. Often the hardest part of having a giant archive of information is how to find what you need out of it and interpret what it's telling you.
I'd rather use an "open" version of this, though. Prepper Disk's website sounds like they're trying to keep their data at least partially locked down, and while I can understand that they want to recoup the cost of the effort they put into setting this up it kind of goes against the grain of prepping to rely on something that you can't repair or modify yourself.