As far as I know, these equipment are mobilised in northern tibet which are pretty far. They would be bombed to oblivion before they reach Doklam.
They wont bring it upto Doklam.
In order to wing a decisive victory against India, China will have to commit 60% of its military power. No military leader will commit such a large chunk of his force purely for brinkmanship. If he moves such a large force, the balance of power against his other enemies in other theaters falls below deterrence levels. Specifically Japan will be able to score a decisive victory against China if 60% of its military is engaged with India.
China is like a fight club with 100 fighters. It has 3 big enemies in the vicinity with 60 fighters each (India, Japan, Australia). That makes China individually stronger than each of its adversaries but its Achilles's heel lies in the fact that it can only take down one enemy and while doing so, it will have to sacrifice itself to the other two enemies. Its deterrence works only when its soldiers are in the barracks and the enemies are left to speculate. Once they are committed in one theater, the bluff has no value.
I used to read Sun Tzu and be impressed but this Communist fruit has fallen far off from the parent tree. This is chillar chap stratagem. They provoked a fight with India and got themselves in a position where India is ready to fight but now China's bluff is caught because they cannot fight. We have subdued them without even fighting, simply by stating our will to fight. The Commies washed away all their cultural and spiritual teachings, now they are like a monkey with a shot gun and no idea how to use it. It has only one shot, and then the monkey will be killed. The only way for the monkey to stay alive is to not shoot and point it at his enemies alternately, not simultaneously.
They will back down, that is for sure, but with how much humiliation that is the question. All the cards are in India's hands now. Even allowing them to back down with a face saver will be a favor we will be doing to them. Who do they think they are scaring with their little mortar fire chindi-giri. Punks. Don't we know that they had mortars? and what are they going to hit with it? If they wanted to make their threat credible, they should have at least taken a lesson from Kim Pong Pung and used a nuclear threat. I used to respect Chinese strategic mindset but this is chindi stuff.