add_filter('woocommerce_get_stock_html', 'custom_show_stock_for_warehouse_category', 20, 2);

function custom_show_stock_for_warehouse_category($html, $product) {
    $protected_slug = 'warehouse';

    // Check if product is in the "warehouse" category
    if (has_term($protected_slug, 'product_cat', $product->get_id())) {
        // Check if password is required (and not yet entered) for this category page
        if (post_password_required(get_queried_object_id())) {
            return ''; // Hide stock level if password not entered
        } else {
            return $html; // Show stock level if access granted
        }
    }

    return ''; // Hide stock for all other products
}
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