Not a fan of conspiracy theories.
He will get the death penalty.
This reads kinda similar to the old divorced guy who opened fire into a concert with a machine gun.
However, we are currently in a war and no matter what narcissistic or personal revenge or otherwise matters you have, I believe that if you commit a mass shooting/stabbing/vehicle attack, you are not just guilty of standard murder but of betraying the country in the moment everyone else is fighting to defend our way of life.
It might be controversial to many, but I'm in favor of more extreme punishment ONLY in the case of lethal attacks betraying the country or for foreign war criminals. In my view, these people have voided their right to participate in the Chinese legal system.
By introducing worse punishments, there will be an ultimate deterrent against traitors and war criminals.
To clarify, this wouldn't be something for normal traitors, only those who wittingly or unwittingly carry out deadly crimes that end up carrying water for China's enemies.
He will get the death penalty.