That image looks like there is a motor at the top which rotates both extruders. I’m wondering about the longevity of the extruder gear in the middle, especially if the extruder gear and the filament gear contact on the teeth of the gear and slip… Also, that motor up top would have to be pretty strong to stop the gears from slipping. I don’t even want to think about the wiring inside with all the gears going round and round. It also looks like the toolhead board is either not there or in the carriage (which is unlikely because it would limit accessibility). Just my interpretation though
edit: Are they using the same carbon rods? it seems so. plus the toolhead cover would have to be shaped pretty weirdly to fit, maybe itll have cutout at the sides. the toolhead would have to have a lot of clearance at the ends of the X axis to account for the nozzles sticking out