He was on his way down. It will never be given nowadays.
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There will be no penalty if:
- the ball touches a player's hand/arm immediately from their own head/body/foot or the head/body/foot of another player.
- the ball touches a player's hand/arm close to their body and has not made their silhouette unnaturally bigger.
- a player is falling and the ball touches their hand/arm when it is between their body and the ground (but not extended to make the body bigger).
- additionally, should the goalkeeper attempt to clear a ball from a teammate but fails, the goalkeeper is allowed to handle the ball.
He wasn't falling. He was already on the floor. Falling is when you're slipping or tumbling/sliding and it hits your arm. If you're in control of your body (he was clearly in control as he wasn't in motion) then it's a handball.