Is insertion of the insulin gene in E. coli an example therapy?

No, it is not an example of gene therapy.

Gene therapy is a technique that involves introducing genetic material into cells to treat or prevent disease. In the case of E. coli, the insertion of the insulin gene is a form of genetic engineering, which is used to modify the genetic makeup of an organism for research or industrial purposes. Insertion of the insulin gene in E. coli is a way to produce human insulin in bacteria for therapeutic use, but it is not considered gene therapy in the sense of treating a disease within a human patient.