Shortcode for showing product count per author

add_shortcode( 'products-counter', 'products_counter_shortcode' );
function products_counter_shortcode( $atts ) {

    $atts = shortcode_atts( [
        'author' => '',
    ], $atts );

    $the_user = get_user_by('login', $atts['author']);
    $userid = $the_user->ID;


    return 'Broj objavljenih proizvoda: ' . $atts['author'] . ' ' . count_user_posts($userid, 'product', true);
}
/* shortcode usage [products-counter author="username1"]