“This document is an Internet-Draft (I-D). Anyone may submit an I-D to the IETF. This I-D is not endorsed by the IETF and has no formal standing in the IETF standards process.”

Yeah, this seems to be an utterly unfixable mess that needs to be thrown out.

What's the process by which people can destroy this and salt the earth?

Don't take it too seriously. It's essentially AI slop. The entire draft mentioned nothing of subnetting under the new addressing schema so I took it is essentially fraudulent on that point alone. This will naturally expire in a few months.