The whole notion of a universal income is the stupidest idea in the entire history of stupid ideas.
It might work. I might not. But it is a possible solution to a problem that we have no idea how to fix, and there aren't many other solutions being floated about.
If you think the problem starts and ends with LLMs, then you're fooling yourself. This is about automation, and LLMs are just a part of that. What do we do when we have fully autonomous trucks? Do you know how many people depend on truck driving for a decent income? We're already working on having robots unload those trucks, manage warehouses, etc.
If something can be automated for less than the cost of a human doing it, that thing will be automated. We've known this for a long time, but the panic only began recently because LLMs threatened white collar jobs.