Hi, RD Web Access role is required role in the RDS deployment and you have to install it with deployment, however if you don’t need rd web access that you can do is to disable IIS default web site and by doing this you will block access to rd web access and that page will not work.

What does RD Web Access do?

Microsoft Remote Desktop Web Access (Microsoft RD Web Access) is a Remote Desktop Services role in Windows Server 2008 R2 and Windows Server 2012 that allows users to access RemoteApp and Desktop Connection through the Start menu or a Web browser. … RD Web Access replaces Terminal Services Web Access.

Is Remote Desktop Connection Broker required?

Deploying virtual servers for RDS A minimal RDS installation requires an RD Session Host and a Connection Broker. On top of that, each client will need either a Gateway server with SSL authentication or a secure tunnel.