Why does vnc still show unencrypted

Why does the system still display unencrypted-Linux general technology-Linux technology and application information when logging on to vnc? For more information, see the following. Why does the vnc logon still display unencrypted information? I have logged on after setting the ssh tunnel in putty according to the tutorial. At this time, the vnc must be connected by putty, however, the unencpted connection line is still displayed in vnc. Doesn't it mean that it has not been encrypted? In addition, If I select always on in the encryption option, I won't be able to log on. Is there anything wrong with me, please let us know