That is incorrect. That is only if you are totally and utterly lost and cannot follow the big, huge red arrows on the floor for transit. There are airport staff at the split also to guide you. And they will even ask, if you are heading for exit, are you sure you want to exit vs go for a connecting flight/transit, as it splits into two different directions - right and left, just around the transit desk.

Now, after you are through the passport scanner, then you are put back into the same security queue as PVG originating pax (after their passport control), true. But, theoretically that can be split up for transit vs. PVG origin pax.