There are two metrics in the study:
> AI chatbots save time across all exposed occupations (for 64%–90% of users)
and
> AI chatbots have created new job tasks for 8.4% of workers
There's absolutely no indication anywhere in the study that the time saved is offset by the new work created. The percentages for the two metrics are so vastly different that it's fairly safe to assume it's not the case.
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5219933
> Our main finding is that AI chatbots have had minimal impact on adopters’ economic outcomes. Difference-in-differences estimates for earnings, hours, and wages are all precisely estimated zeros, with confidence intervals ruling out average effects larger than 1%. At the occupation level, estimates are similarly close to zero, generally excluding changes greater than 6%.
If people save an hour a week and use that to browse HackerNews, they've saved time but haven't produced any economic value, but it doesn't mean they didn't save time.