SYSTM is not a virtual world experience, so the trainer will not be producing any terrain but will be following the workout intervals. The video may seem convincing at times, but the workout is following the interval targets and not the hills you're seeing on the screen.
The workout experience
If your smart trainer is in ERG mode, you should feel the resistance increase with the interval changes as they are shown on the workout graph.
For more helpful tips see:
A Guide to using ERG mode
A Quick Start Guide to the SYSTM App