I think you are twisting things a little....
He was stripped of the Captaincy - and Capello resigned because of that - until after the trial; the trial found him not guilty of the criminal offence; he was charged by the FA under its rules; he retired from International Football; an FA hearing (that started the following day) found him guilty.
There were no changes of rules as far as I can see. Can you point out which ones were changed?
That's how I read it too. It's irrelevant as whatever the underlying reasons behind his decision, he's called time on international football and so was unavailable for selection