That's the same video that shows it magically transforming into jelly to make the turn at the 2:00 mark, so I'm not totally sure if I trust it.
Well the video is obviously just an illustration. If you can do it for trains and subways, I don't see why this bus can't make a turn.
Google "bendy buses" the design they are proposing between segments is exactly the same as this. Nothing magical or gelatonus about it.
"Mr. Song said the buses were fully capable of turning corners, though the cars underneath must wait until the buses have passed before turning themselves"