Yes you can. Only owner can sign this one, while need to get witness signature (by commissioner of oath/magistrate/section court judge)
That is the extent I can gauge from the content of the file, but I do not know what this is ultimately for.
My guess is that this is a special provision for those illegal renovations (done before 1 June 2014) and now they are applying for approvals and CCC.
Because the under the CCC system, some forms needs to be signed by CIDB-registered contractors. But most if not all those illegal renovations are done by non-CIDB-registered contractors or it has been too long, lost contact, etc. So as the owner you have to declare that the works are done according to the approved plans (which are approved post-construction).
My guess is that this letter will replace some forms under the CCC, and will be attached alongside the Borang F; whereby the Borang F can only be issued by architect or registered building draughtsman, whom is the one who did the submission for your house under this special program.