I don’t agree. IMO the simultaneity is actual in the film example, where the mind is concurrently processing “input” from both eye and ear and putting it together. I can’t think of anything in the EBTs which would prevent this simultaneity.
Next time you’re watching a film, focus on the visual images on the screen - does the film soundtrack completely disappear? Alternatively, focus on the film soundtrack - do the visual images on the screen completely disappear? In my experience the answer is “no” in both cases, it is more like a change of focus from foreground to background.
Possibly we need to look more carefully at the distinctions between consciousness ( vinnana ), contact ( phassa ) and attention ( manasikara ).