Manal,
The LIC is really good and shows that there hasn't been any significant iron absorption yet. However, iron load in non-transfusing intermedias can slowly build up over the years, so some regular monitoring is recommended. You do have a baseline measurement now, which will be helpful over the years.
The Standard of Care Guidelines for Thalassemia have this to say:
18.1.6 Assessment of iron overload.
Ferritin and iron saturation levels should be monitored
annually. If the ferritin levels are persistently greater than
1,000 ng/mL or the iron saturation is greater than 60
percent, obtain a quantitative assessment of liver iron.
Quantitative assessment of liver iron refers to the scan or biopsy. This will only be necessary to do once his ferritin stays above 1000 over several months. For now, continue with a low iron diet and encourage tea drinking with meals. I think hydroxyurea also has an impact, since overall bone marrow activity will be lower, which in turn leads to a lower rate of iron absorption from food.