To delete the integration, you will need to delete the Cload Configuratoin node you created in AEM via the CRX/de tool.

For anyone who might have the same question. Below is the answer I got from Adobe Day Care and that seemed to remove the "Publish to Brand Portal" option from AEM Author instance.

Thanks it looks like it. I haven't had any luck finding any documentation on removing it.

Hi,What are steps to remove "Publish to Brand Portal" option from AEM instance?. We want to get rid of the integration between AEM and Brand Portal.Regards,Srujan