Multiple issues with this article (and maybe the underlying study).
No mention of the sampling strategy - what were their average hours of work per week ? What was the average income (not including $1000 from the UBI)
Why is productivity measured as # hours worked? I can sit on my ass without doing anything or I can bust my butt to get shit done. It’s a lot easier to generate good work (and do more with fewer hours) when I’m not stressed about where my rent is coming from.
What about other outcomes besides work? How about amount of savings and ability to cover unexpected expenses? It’s certainly a good thing for people to get some savings for emergencies, job loss etc even if the benefits aren’t seen in the economy for a while. But even if people are spending that money it still supports the economy regardless of whether it is done in the name of leisure or to get a new job.