No, theme support doesn’t include FREE Customization. Please see ThemeForest Policy regarding what’s included in the support.
ThemeForest Official Policy regarding what’s included in the support:
Item support does not include services to modify or extend the item beyond the original features, style, and functionality described on the item page. For customization services that will help you tailor the item to your specific requirements, we recommend contacting the author to see if they privately offer paid customization services or check out the great service providers on Envato Studio.
For more Information see What’s Not Included.