ADF managed vnet connect to on prem sql server

Hi

Am following below article and under pre-requisites it is mentioned that we need to create express route as well but i didnt see express route resource being used in any of the steps detailed in given article , so wondering if we still need express route .

https://learn.microsoft.com/en-us/azure/data-factory/tutorial-managed-virtual-network-on-premise-sql-server