There are many ways to discipline children, and a majority of them do not involve corporal punishment, ie spanking. Just because one does not "use the rod" does not mean they do not love their children. While I have spanked my children it is only used for very dangerous issues, ie walking out into traffic, jumping off high places. Even then it is three swats and then lots of talking and hugging and letting them know that even though I spanked them they are still loved.
I think the 'advice only' option is for ASKING advice, not stating your advice. And the interpretation of that verse is highly debatable, something I dont feel like hashing out at the moment.