My HKTD says the Chinese market reference price is only partially relevant to AVZ. And that fact is indicated by how hard AVZ worked to improve terms beyond the average WIN-win formula China operates with time and again.
I can not completely confirm though except to say AVZ makes vague reference to various pricing if any one recalls in announcements?
“Pricing USD/CIF, China determined by a formula which references various published market prices of lithium carbonate and lithium hydroxide products and underpinned by an agreed floor price..”