The problem is that for retargeting to work correctly, the rest pose must exactly match between the avatar and the animation.
I updated the animation retargeting tool to work with your animation and avatar:
You can see that the orientation of the clavicles don’t match (and probably other bones too).
I tried to update some bone orientations of the animation and could come up with:
It’s not perfect, but it shows it’s possible to make the retargeting process work better by updating the avatar and/or animation rest pose.