my take on the photo is this is a test rig for the entire running gear. The hydraulic lines connected to each roller set under the track seems to enable to the roller to be pressed up into the vehicle to actively simulate suspension articulation the vehicle will undergo when running across rough terrain at speed. the chassis is probably bolted down. the simulated ground press up hydraulically to work the suspension, rather than the vehicle weight pressing down down to work the suspension.
so this suggest the narrow tracks is part of the characteristic of the running gear being tested, not an artifact of corner cutting during tests.
so this suggests to me the chassis is for an lighter vehicle. either the chinese decides the next generation tank will be much lighter, or this is for a new APC or MICV.