I suggest you take that document down as it contains your name, DOB and NI number.
That form has nothing to do with a Stat Dec.
All the court needs to know is that you have been convicted of an offence via proceedings of which you had no knowledge and that you want to make a statutory declaration to have the conviction removed.
I can see there being confusion with the term “original offence”. Once the SD is done the niceties of that can be sorted out and you can make your offer to plead guilty to the real “original offence” provided the FtP is dropped.