You do not have to admit that....
The Access to Information Act says that no person shall hinder, block, destroy or alter a document. The fact that you blocked the release of a document as you did contravenes the act, more specifically, section 67.1 of the Access to Information Act, a contravention that has consequences of a criminal nature.
Did you or did you not contravene the act or block the information in question? If you did, did you receive a directive to do so? There are two possibilities: either you did it on your own initiative, directly contravening the act, and you are responsible, or you received a directive to do so.
What I want to know is whether you received a directive. Is there a procedure that was not part of your mandate but that you were subject to, or did you do it on your own initiative? That is what I want to know.