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_9521a3fc-6ba5-4da6-9936-20ad0ec093d4_deletable_wrong_ver=1.0.0:cmp_ex"