frame by frame, the ball clearly disappears while the post is 100% visible. There are a couple of frames where you can see part of the ball but even in those shots the post is still visible, meaning what you’re seeing is the ball sticking out on both ends as it goes through
https://share.icloud.com/photos/0b7zZjZ0j9BlG8PaB1mkv5SXQ
https://share.icloud.com/photos/0e9z6XWnUMt8Z8mw-NTrcIjug
https://share.icloud.com/photos/0c2RPiX3jFdqDhIOqP753IU_w