So, the clarification in March was simply that, a clarification, not a law change.
And a bit more reading on IFAB shows the clarifications made at their meeting in March have led to minor amendments to the laws for 2021-22. Presumably in part to make handball more clear:
Law 12. Fouls and Misconduct
Not every contact of the ball with the hand/arm is an offence
A player’s hand/arm position should be judged in relation to their body movement in that part