Earlier quoted context omitted.
Isn't that the point of UBI? Getting us past the local maxima of "this job is soul-crushing and a waste of a person's intelligence, but economics make it cheaper to use a body than a robot"?
No, all you need are cheap robots to get past that local maxima. The point of UBI is to ensure people don't become destitute when we reach that point.
If 50% of the jobs in a field are automated, in the near term you still have 100% of the former labor looking for that job, pushing salaries down towards their minimum, thereby reducing the cost effectiveness of further automation.