... which is the same as the official Moodle documentation at https://docs.moodle.org/36/en/Activity_completion_settings#Changing_activity_completion_settings_in_bulk
The link you supplied is for that organisation’s particularly installation of Moodle and the version that they are currently using, which may be slightly out of sync with the latest version of Moodle so usually better to seek out the links to the official documentation.