The chat is referring to the padlock icons on messages, which are closed. The open padlock in the notification bar means that your passphrase is currently cach

The chat is referring to the padlock icons on messages, which are closed. The open padlock in the notification bar means that your passphrase is currently cached and anyone that picks up your phone can read your text secure messages. How frequently your phassphrase gets flushed and must be re-entered is a user setting.