Moving Root Volume in Cdot

i need to move a 8.3.2 cdot root volume to a different aggregate. I am using the following KB article as a guide:

https://kb.netapp.com/support/s/article/ka31A0000008gyeQAA/How-to-non-disruptively-create-a-new-root-aggregate-and-have-it-host-the-root-volume-in-clustered-Data-ONTAP-8-2-and-8-3-ONTAP-9-0?language=en_US

Unless I am missing something, I see one major issue with this approach. In the 7-mode approach, which I've done (see link below), you snapmirror the contents of the existing root volume to the new one, so you don't lose any contents. The cdot article describes creating a brand new volume without transferring the contents. Are the contents transferred "behind the scenes" once you tell the OS where the new root volume is? Would love to hear from anyone who has done this. Thanks!

https://kb.netapp.com/support/s/article/ka31A00000012HuQAI/how-to-move-or-rename-the-root-volume-on-a-storage-system