Besides improving MS, the study also mentions reduction of visceral obesity.

High visceral body-fat is one of the symptoms of MetS.

Correct. But it seems anyone with excess visceral fat alone could benefit from TRE, even if not suffering from MS, which is having 3 out of 5 symptoms:

- Abdominal obesity - High blood pressure - High blood sugar - High serum triglycerides - Low serum HLDL