That sounds like another "explanation" invented to justify bad wording.Not sure what you mean by this. Played or touched has been in the LOTG for a very long time.
And the concept of a defense play but not touch as well.
And long before the narrowing of what a defense play was in recent years, one of the explanations for why it took a “play” by a defender to erase the OS restrictions was that if a defender was touched by the ball, it had still been last “played” by an attacker. So it had still been last played or touched by an attacker.
I've no idea what distinction was originally meant, when it was used to say it's not offside when "the ball last touched an opponent or was last played by him"). There was no "touched by" for the offside pass (by the team-mate), only when "the ball is played". It would be nice to think the present position is meant to make a distinction that "played or touched by" an opponent always intended - but that would mean that for decades it had been incorrectly applied by any touch by an opponent negating any offside.