I notice the screenshots for tge GWE Resmaster include the Class 484 tube. Do we know if this comes with the route (I'm assuming it does) and hence you don't need it already (from the Bakerloo update add-on if memory serves right)?
I think they are just taking the 484 from the IOW 2022 route and repainting it? So I think you may need that route as a layer but someone else can confirm