IMO, this is similar to Android's Battery optimization. On TV it probably will kill the app background service when not in use.
I think this means that the energy optimisation functions don't work with Netflix meaning it is unaffected.
Change the settings and see if there is any difference. I don't have this setting on my A8G.
Does it seem like anything is wrong when you use Netflix?
energy optimization OFF = app get full cpu power, app not get put in sleep mode or closed when in background.
energy optimization ON = app is not prioritized, cpu could lower cpu frequency to save energy, app could be in sleep mode and not respond to notifications until active again, app could be closed if became a background app.