You are using staging server - a separate instance of the ESP Component Registry that allows you to try distribution tools and processes without affecting the real registry.
# Example readme Description of the example.
To create a project from this example, run:
idf.py create-project-from-example "test_component_manager/test_3cb69900-19b1-483e-9263-d5f104e8a16b_example_readme=4.0.19:cmp_ex"