Question

and yet the column is not editable . Ideas?

Answer 1

Whatever you are trying to do (addColoumnBinding??)
you are setting the column to be not editable: setEditable(false). Eventually you should do

setEditable(true);

Like @mKorbel has pointed out, the better way to customize a JTable aspect and behavior is implement your own table model extending AbstractTableModel.
If you do that you can implement the following method:

boolean isCellEditable(int rowIndex, int columnIndex) ;