That does not say anything about how much work exists in aggregate. The human population has gone up, so it can be simultaneously be true that the amount of work being done increases even as each worker works fewer hours. As well, this also says nothing about the quality of work, as GDP is going up, so it can also be simultaneously true that the quality of work increases even as each worker works fewer hours.

I think the relevant metric is the amount of work per people, not the agregate amount of work. If tomorrow there's twice as many people but only one more job because of AI, then sure! the agregate amount of work has increased.