The subtitle on the second image says:
"这个战术背心前后片均设计软质防弹层袋和插板袋" -The front and back pieces of this tactical vest are designed with soft bullet proof layer pockets and flap pockets for plates.
So I guess the plates are not shown but do come with the vast separately
They are special high-altitude gear, first unveiled in October of last year and specifically ordered for border troops. They are also a follow-on to a previous iteration of high-altitude gear that was unveiled in 2018 (in old camouflage patterns).