This presumes quite a bit. As it stands, AGI has not been achieved, and this article is claiming that, by 2028, 90% of all knowledge-worker jobs will be done by an AI system.

Even were that to happen, it is unlikely that a UBI would be put in place, or if it were, that it would be successful. An Ouroboros of taxing owners to pay the public who buy from the owners wouldn't be successful. The reality is that were all workers to be replaced by AI, the economy would collapse. Then, the owners of the systems would be forced to liquidate their assets, the prices on GPUs would crater, and the AI means of production would be redistributed among the hands of the public. Then, small models would be driving productivity in the new wave of startups following the crash. This pattern could repeat many times.