I should have spotted this one first time around... If the user in "
[email protected]" is not root, then rsync will not be able to change ownership. Only root can set the ownership of a file or directory to another user.
Note that in order to log in, you may have to change 'PermitRootLogin no' to 'PermitRootLogin yes' in sshd_config, if you have that option set.