Most VNC clients don't support SOCKS proxies so can't use the dynamic port forwarding (the D in D8888). You can forward a local port to a specific machine+port instead but it will mean one such local port mapping per remote system you want to VNC to. (This is in the article you linked to - it shows such a mapping).

Forwarded Ports: L8889 x.x.x.x:5900 (x.x.x.x address of achine you want to VNC to)

Some VNC clients do support SOCKS proxies but it tends to the paid / pro version.

Most VNC clients don't support SOCKS proxies so can't use the dynamic port forwarding (the D in D8888). You can forward a local port to a specific machine+port instead but it will mean one such local port mapping per remote system you want to VNC to. (This is in the article you linked to - it shows such a mapping to the localhost at the other end of the SSH tunnel). You then VNC connect to the forward port on your local machine and SSH tunnels it for you to the specific remote address:port.

Forwarded Ports: L8889 x.x.x.x:5900 (x.x.x.x address of machine you want to VNC to)

Some VNC clients do support SOCKS proxies but it tends to the paid / pro version.