I'm a little confused by Mr. Dewar's preoccupation with this. As I read proposed subsection 55(1), pertaining to both the English and French versions, it clearly states:
The Chief Electoral Officer may enter into an agreement with any body responsible under provincial law for establishing a list of electors, governing the giving of information contained in the Register of Electors,
--and then we can skip to the end--
if that information is needed for establishing such a list.
So it's referring to a provincial body that has legal authority for establishing their provincial list of electors. The Chief Electoral Officer, at the Canadian level, may provide them with information that is contained in the national registry “if” that information is necessary for establishing the provincial list.
I think it's pretty clear.