SQL Server Standard License over written because of Report Builder Evaluation version
The person is wrong; that is clearly an Evaluation Edition install, not Standard Edition. The SKUs are all on the same ISO typically, so even if you download an ISO that says Standard Edition, you can still choose Evaluation or Express during install.

Report builder should not cause this situation; however, it could also happen if you install a Standard Edition engine, and then install Management Studio from an evaluation download (for the same or different version than the engine).