Not fake news. It prevents you from using key authentication without password authentication. Which means it doesn't really support key authentication. But the context is really about portable home directory and other such cases which are completely unsupported by systemd. Also, as the link to the full context is provided, it also further explains the details and proper context: https://poal.co/s/Linux/513335 which points to: https://opensource.com/article/22/3/manage-users-home-directory-systemd-homed