He's not wrong. But UBI isn't a SV invention, far from it. Applied to SV, it does serve to continue concentrating the wealth. There was an interesting author on KQED forum a day or 2 ago who wrote a book about our betters keeping us down in just this way. I found that guy a bit ridiculous but again, not wrong.
About the subject matter:
My understanding is that, in general, software's winner-take-all economics has joined forces with globalization, robotics, and machine learning to usher in a historically unprecedented era of extremely high competitive pressure. As a result, a growing population of tens of millions of Americans aren't that competitive in the economy, which is Really Bad.
The author says UBI "showers the cash down on the people so they can continue to spend. As a result, more and more capital accumulates at the top. And with that capital comes more power to dictate the terms governing human existence. Meanwhile, UBI also obviates the need for people to consider true alternatives to living lives as passive consumers."
To me, this is not a rigorous or convincing argument that UBI will exacerbate the challenges of our modern economy. Or that UBI will have the effects he claims. Or that those effects are well-defined and make sense at all.