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.
To create a project from this example, run:
idf.py create-project-from-example "test_component_manager/test_290d67eb-cb0d-4ef4-88e1-adce8e496e93_deletable_wrong_ver=1.0.0:cmp_ex"