But that wasn't the old rule was it ? The rule is in two parts, and always was. In summary, a) Is the player in a position where there are not at least two defenders between him and the opponents' goal line? If yes, he is in an offside position, "offside". b) is he influencing or seeking to influence the play at the time when the ball was last struck forwards by a team mate ? If yes, an offence of 'offside' is committed. All subject to his not being in his own half, not receiving the ball from a throw in etc
All this talk about first phase and second phase is meant to make clear how those principles are applied. That it confuses everybody is by the by.