I think it's clearly recorded in-camera, and I think real camera footage - the reflections in the (plexi?)glass screens show the robots and people holding cameras. I'm not even seeing any obvious indications it's been denoised.
As someone who works in the VFX industry, faking reflections on wobbling/flexing glass screens (static ones are easy) is actually pretty difficult to do right, and I doubt they would have added the camera operators if they were faking it.
Some of the aspects making people think this is CG are the diffuse lighting (no obvious hard shadows or occlusion), very clean robots, "weird" (i.e. not normal, but I believe it's honest for the robots) motion, and lack of sound.
As someone who works in the VFX industry, faking reflections on wobbling/flexing glass screens (static ones are easy) is actually pretty difficult to do right, and I doubt they would have added the camera operators if they were faking it.
Some of the aspects making people think this is CG are the diffuse lighting (no obvious hard shadows or occlusion), very clean robots, "weird" (i.e. not normal, but I believe it's honest for the robots) motion, and lack of sound.