Yes, those are ACF fields. In this case ACF is duplicating what you would see on the standard WP attachment popup. When submitted ACF populates the information into the standard WP fields that are used to store this information.
The only way to “remove” these fields would be to add custom CSS to your WP admin to hide them. I’m not exactly sure of the CSS that would be needed to do this. If I have a few minutes today I will look into it.