>I did not notice that. So, then it really doesn't tell us anything new.

It was in the linked article:

https://www.nature.com/articles/s41591-021-01336-3

It's always good to go to the sources when looking at these potentially overhyped news articles. I would love this to be the answer to depression, but I'm somewhat skeptical. I'm also cognizant of the power of the placebo effect (and related psychological factors) in changing the brain, having fully recovered from ME/CFS and severe depression/anxiety myself.