I remember one business class anecdote, where the conclusion of changing workplace conditions (light, music, etc. both ways) was that productivity studies increase productivity ...
Only if you do bad science experiments without a control group, otherwise you'd see the control group productivity boost as they'd also be under the same scrutiny. I didn't read the study methodology, so I'm not comparing to that, only responding to your comment in isolation.
It's Hawthorne effect
https://en.wikipedia.org/wiki/Hawthorne_effect
Related to it we have novelty effect and bunch of other psychological effects that are hard to isolate in human science. In this sector, a lot of studies cannot be repeated.