But both lorries net weight and speed before impact are different.
Unless we compare both in a controlled environment, we are just comparing orange to apple

I am totally fine with Proton strengthening their cars, in fact it is a extra selling point to convince potential buyers.

But, do you mean that showing these Proton photos implies other car manufacturers do not use hot pressing steel in building their current models?
Be careful this is a deductive fallacy trap you might fall into. If you really want to prove, you should get the actual steel types being used by major car manufacturers and compare them with Proton.