I think things are even getting a little off-track splitting hairs over the differences between source based and individual work based tagging. I think a better question for actually resolving anything here is
How close does a statement need to be to the post in question or the source work to count as a valid Lore Source?
I don't believe I've ever seen a clear site-doctrine statement on this, it's just been a vague if the artist says X and the need hasn't really come up because people don't tend to fight over lore tagging. Well it's here now. People are fighting over whether in the lack of a clear artist statement, there is enough evidence in the source work to class Rivet as trans by default. What is the requirement for a tagging-valid artist statement, and what are the requirements for source-canon statements?
Secondarily,
What happens when successive works of a source franchise contradict past works?
This is a known frequent element of serial writing.
Personally I'm of the view that
- Whichever work you are currently viewing is the one that "Is Canon."
- Characters or other elements should not be tied too hard to any one specific work, as they may appear in others of the same franchise with vastly different canon.
We need more than petty argument about this; we need a clear site-doctrine stance.