The page you're linking is for "TVision Home", which is a different older product with an STB: https://www.t-mobile.com/support/tv/equipment/get-started-with-self-installation
The new TVision Live offering does not include TVE.
Like @srrudin said, you can try it yourself and it doesn't work. Go to nbc.com/mvpd-picker and select T-Mobile. The login is not accepted for TVE.