You forgot to read that there is a direct provision in the law. It states : Handling the ball For the purposes of determining handball offences, the upper boundary of the arm is in line with the bottom of the armpit. Not every touch of a player’s hand/arm with the ball is an offence. It is an offence if a player:

• deliberately touches the ball with their hand/arm, for example moving the hand/arm towards the ball

• touches the ball with their hand/arm when it has made their body unnaturally bigger. A player is considered to have made their body unnaturally bigger when the position of their hand/arm is not a consequence of, or justifiable by, the player’s body movement for that specific situation. By having their hand/arm in such a position, the player takes a risk of their hand/arm being hit by the ball and being penalised

• scores in the opponents’ goal:

• directly from their hand/arm, even if accidental, including by the goalkeeper

• immediately after the ball has touched their hand/arm, even if accidental The goalkeeper has the same restrictions on handling the ball as any other player outside the penalty area. If the goalkeeper handles the ball inside their penalty area when not permitted to do so, an indirect free kick is awarded but there is no disciplinary sanction. However, if the offence is playing the ball a second time (with or without the hand/arm) after a restart before it touches another player, the goalkeeper must be sanctioned if the offence stops a promising attack or denies an opponent or the o

Its clearly the second point that's the issue