I don't agree with a few things that is said, especially about the part where India's and China's economies are devastated in the end, which doesn't make sense since neither side can really destroy the others's economic capabilities with just conventional weapons.
But it's true that neither India nor China can actually fight a lot considering the terrain. But India has the advantage when it comes to all three, army, navy and air force.
When it comes to the army, the IA is already forward deployed to the border, whereas the Chinese are sitting comfortably in the plains. The reason is they don't have any interest in fighting India at all. So they haven't found the need to bother with mountain warfare as much as India does. What this means is our personnel living in the mountains have significantly superior experience. And it's also true that neither side can enter each other's flat lands, or they risk getting annihilated. This is true even for the US and Russia, if they bring their ground troops to the fight also.
When it comes to the air force, the IAF operates from the plains while the PLAAF has to operate from bases that are 4000m high. So their payload capability is so low that they cannot really hope to fight India here. And I'm not talking about just bringing firepower from the air, that's easy. The main hurdle will be logistics. PLAAF transporters and helicopters will lift barely anything worthwhile in support of the PLAGF. Mountain warfare is all about logistics.
When it comes to the navy, both IN and PLAN cannot fight in each other's territories. It's too far and both navies are still not up to the task of operating in large numbers outside their sphere of influence. So the IN will use its capability to deny PLAN the space to operate within the IOR, while the USN devastates PLAN.
The authors also make one mistake. They have assumed that India does not possess conventional ballistic missiles, primarily SRBMs, which is plain wrong. We not only have enough ballistic missiles to make an impact, but we have the means to stop their SRBMs also.
What could also compound the problem for the PLA is if the USAF joins in the fight at the border with a few squadrons of the F-22. The F-22s can be loaded up with Indian IFF, radios and datalinks used on the MKI for interoperability during the time it takes the PLA to deploy in the Tibet region. Eventually other jets can be brought in if the war prolongs. I'm assuming the war goes on for many, many months, even years, since that's how long it will take for blockades to make a significant impact, as mentioned in the video. Interoperability between US and India will be significantly superior to Russia and China.
So when it comes to the action at the border, the video is more or less accurate. It's too bad they don't explain enough about the fight between the USN and the PLAN/RN. That's the one that will actually decide the fight. All it does it talk about blockades, when Russia can easily supply China will all the oil and gas it needs.