If actual shooting starts, the Indians will be beaten badly. If the Indian Air Forces tries to challenge, China’s superior aircraft, electronics and armaments will result in a turkey shoot. China will control the air. Indian land forces will not be supported or resupplied. Sorry but that is just the way it is. Hopefully The US has observers in place to learn.
Which "superior" aircraft? Also I doubt if the J20s, if that unknown entity lives up to the deliberately created hype, have the legs to take off from beyond the Himalayas and reach the border areas without refuelling. Any aircraft based on the plateau will be severely degraded in fuel and payload. And India uses Israeli and French electronics. Not going to be a turkey shoot.