exclude categories from pdf invoice

Hi there,
I found an old support question about excluding categories and tried using the filter you suggested to them. I still see the products being added to the pdf invoice. Here is the code I’m using:

add_filter( 'wpo_wcpdf_custom_attachment_condition', 'wpo_wcpdf_exclude_product_categories', 100, 4 );
function wpo_wcpdf_exclude_product_categories( $condition, $order, $status, $template_type ) {
    // only apply check on invoices
    if ($template_type != 'invoice') {
        return $condition;
    }

    // define categories which shouldn't get an invoice here
    $no_invoice_cats = array(34);

    $items = $order->get_items();
    $order_cats = array();
    foreach ($items as $item_id => $item) {
        // get categories for item, requires product
        $product = $order->get_product_from_item( $item );
        if ($product) {
            $terms = get_the_terms( $product->id, 'product_cat' );
            if (empty($terms)) {
                continue;
            }
            foreach ($terms as $key => $term) {
                $order_cats[$term->term_id] = $term->name;
            }
        }
    }

    // get array of category matches
    $cat_matches = array_intersect($no_invoice_cats, $order_cats);
    if ( count($cat_matches) > 0 ) {
        // 1 or more matches, don't attach invoice
        return false;
    } else {
        return $condition;
    }
}

Can you tell me what I’m doing wrong? My category name is “No Tax Receipt” and the category id is 34.

Thanks!