I am not sure what the purpose of subsection (1) is. It says that a document is not delivered unless other things are done, which are set out separately, but is that not stating the obvious and repetitive?
When the registrar receives documents she has to decide whether to make the information contained in them available for public inspection. The clause clarifies her powers in that area and ensures that the registrar has the power to omit from the register any or all of the information contained in a document that does not meet the necessary requirements. Examples of that could be information that is not sent in conformity with the rules, in a form or manner of delivery that is not properly authenticated, or where the necessary fee has not been paid. The registrar will still be able to accept and register such a document at her discretion, but by accepting it she will not be exempting the person who is filing it from any consequence that might attach to their failure to comply with the original requirements for delivery.
Taken together, the elements of the clause provide a sensible framework for ensuring that defective material does not get accepted and placed on the public register, and that there is appropriate discipline on companies to ensure that they file documents in the correct way—that is surely the main point—while providing a degree of discretion to the registrar in cases of genuine doubt.