How does this study relate to fairly recent topic of lack of evidence that low serotonine levels causes depression ? Should the diet metaanalysis be redone afte

How does this study relate to fairly recent topic of lack of evidence that low serotonine levels causes depression ? Should the diet metaanalysis be redone after that study ? https://news.ycombinator.com/item?id=32160703 https://news.ycombinator.com/item?id=32160703