Foreman_Ansible Key SSH Passphrase not working

Is there any reason why the Foreman Ansible 2.X has ssh passphrase added to the documentation when it does not suppose to support it?

https://theforeman.org/plugins/foreman_ansible/2.x/index.html

“By default foreman-ansible relies on the settings of Remote Execution for SSH connection options, like SSH user and password or the SSH key passphrase”