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_51098fa1-7358-41f0-9bdc-b9c643499d58_deletable_wrong_ver=1.0.0:cmp_ex"