This is only a threat if you enable agent forwarding for all hosts. If you enable agent forwarding for all hosts then yes, data will be forwarded. Your link s

This is only a threat if you enable agent forwarding for all hosts. If you enable agent forwarding for all hosts then yes, data will be forwarded. Your link says: > Don’t enable agent forwarding when connecting to untrustworthy hosts. Fortunately, the ~/.ssh/config syntax makes this fairly simple