Category isn't being excluded

so I use

function jetpackme_filter_exclude_category( $filters ) {
    $filters[] = array( 'not' =>
      array( 'term' => array( 'category.slug' => 'news' ) )
    );
    return $filters;
}
add_filter( 'jetpack_relatedposts_filter_filters', 'jetpackme_filter_exclude_category' );

in functions.php in order to exclude the “news”-category.
This doesn’t work for me. Problem is still there after debug

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