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_23c7f572-41c8-49ad-a39d-9a283fd36625_example_readme=4.0.19:cmp_ex"