I'd sooner trust the metal shield than a plastic riot shield.Metal shields seem like a bad idea for this environment. They are heavy, cumbersome, and sink in water.
Interesting that the last image shows construction equipment. That does confirm some of the earlier rumors.
Those are used to protect against projectiles, I don't know how they would stand up to some of the pictures of weapons I've seen that were used in Galwan.
A heavier mass means its less likely to move around when struck. You can also clobber the enemy with them, just like in medieval times.