This is correct. The issue at hand is talking about just how short-sighted and mis-informed this statement is:
"I personally see IPv6 adoption going to a full stall if users are told that advertisers found a way to tattoo cookies on their machines."
The only person who's talking about IPv6 "privacy" addresses is you. I don't understand why you keep bringing them up in a conversation about the effectiveness of browser fingerprinting.
I skimmed RFC 7217. It's not incompatible with "privacy" addresses. The RFC in question even mentions the orthogonality:
"The method specified in this document is orthogonal to the use of temporary addresses [RFC4941], since it is meant to improve the security and privacy properties of the stable addresses that are employed along with the aforementioned temporary addresses."
I don't see what your problem is.
If you're not interested in talking about the effectiveness or lack thereof of browser fingerprinting techniques, then I've no interest in continuing this conversation with you.