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_2c3b775e-50ad-4fe9-8f3f-722de41fbcb2_deletable_wrong_ver=1.0.0:cmp_ex"