The annual report [ref] also seems to indicate the prices set as of September 25 were binding?
FWIW here’s a short legal analysis on Scheme Implementation Deeds Rhys : https://www.minterellison.com/articles/how-a-scheme-of-arrangement-works
… and once again I think a key word was ‘binding’ (in this case as of terms set on 25/09/23).