That seems unlikely - unless it somehow avoided making pure aluminium first, its notoriously difficult (and quite dirty) even by modern standards to rerine alum

That seems unlikely - unless it somehow avoided making pure aluminium first, its notoriously difficult (and quite dirty) even by modern standards to rerine aluminium, due to how strong bond aluminium compounds form (which is alsow what protects aluminium from the elements once you have it - a quickly forming thin layer of aluminium oxide).