I am just telling you there are many drawing out, made by others than me... who represent the Causeway with two ramps containing a divide. Your complaint is misplaced. Go educate them first, and then I will listen to you.
Until then, I say the Giza Causeways had two platforms. Showing a barren causeway, only indicates to me, it was worth disassembling and hauling away. For a Funicular to work, it would require the best stone base, with a top layer of polished granite and/or basalt.
In my mind, that only indicates, why it is no longer there.