Watching Tv
No, watching TV within itself is not a sin. However, the content that we watch can be immoral, which obviously is not permissible . Also, if we binge watch oblivious of our other responsibilities then it could enter the boundaries of sinning as well.
Can you please let us know which scholar said it ? I am sure Ghamidi saab is not of this view, and many Muslim scholars don’t subscribe to such a view.