How to remove parent section in an attachment URL in wordpress?

You can add a filter to the function that gets attachment links to force that format:

function wpa60888_attachment_link( $link, $id ){
    return home_url() . '/?attachment_id=' . $id;
}
add_filter( 'attachment_link', 'wpa60888_attachment_link', 10, 2 );

Calls to get_attachment_link will have this filter applied to the output.

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