For the wheel pic, if it is not the parts problem, then must be engineering problem. 1st, look at the car pic, when the wheel become like this, the front lower arm must be damaged. Commonly happen is the ball joint separated from the arm. 2nd, look at the hump. If hit by high speed, the car should ran over it in stead of crushing it. Afterall, it is not a 2ft high wall. 3rd, Look at the damage from the divider, it cannot justify the damage on the car. The car is not loaded with 5 tons concrete bricks so let say the divider is 12" high and the car cannot run over it, when the car hit on it, due to the momentum make the car lighter, both the car and wall will suffer damage of cause but the weight will not able to break a ball joint housing or somewhere on the lower arm. The only reason to explain is the lower arm failed before crushing or failed during collision. If failed before incident, it can be explained as individual case before 2nd or 3rd similar cases happen. If failed during collision, then it will have big possibility of parts under spec or car engineering flaws which may effect the rest of the production.
The welding pic from tokobakso.com clearly showed that the part is hand welded but not spot welded. Based on the pattern and size, it should be MIG welded. I don't know if every preve has the same problem, but from the pic, at least 2 are out there. The only thing can explain is that there was a flaw in the manufacturing process and after they find out, they simply tag a few spot, tough up the paint and then deliver to the showroom. As it is just a door, owner can ask workshop to fix it easily.