If you look in the discussion section, the dosage used was about 50 mg/kg (reported as 10 micro mol/l) which would be over 3,000 mg for most people. A much higher dosage than in t3 fuel.
Also the rats did not experience a significant change in tsh or other thyroid hormone panels. They didn’t report the findings (which makes you wonder), but they hypothesize it would take a longer treatment.
Anyways I think this study just shows that you may need to supplement with a small amount of additional sodium and iodine. That’s all. T3 fuel already has iodine and there is no shortage of sodium in most people’s diets.