Didn’t trump win with about 27% of the population voting for him?

That is factually incorrect. Apart from conscripted civilian brigades and penal batallions, Soviet soldiers didn’t suffer from a lack of small arms or ammunition. What they lacked was fire support in the form of artillery pieces, tanks and aeroplanes.

The accurate parts of this scene are the lack of direction from officers and the NKVD blocking divisions. Other than that, this scene and this movie is laughable from a historical perspective.