The ruling applies to all pilots domiciled within the EASA member states, regardless of seat position.
What a lot of tosh you write! Have you actually bothered to read the legislation - or even part FCL? Clearly you have not. It matters not one toss where any pilot, left or right seat, lives, is domiciled, resides or sleeps the night!!
The two pertinent aspects relate to where the "operator" of the aircraft resides, and the state of registry of the aircraft.