what contribute? then show me photo proof which 5 star NCAP front collision test came with engine drop out of the engine bay?

this describes a sliding action as well.. in no way does it imply to slide means come loose from the engine bay

Since several China made cars today managed to pass US/EU/AU safety rating, it's not strange that the Preve (rumored to be tech from China) survived frontal collision and rollover.

As for that lady driver, she asked for it. She wanted to speed at 160km/h on that not so well designed highway yet her Preve is low spec variant without VSC so when she took a swerve a bit too hard, it lost control and hit the left then right divider and went into few loops of rollover. The roof caved in is either caused by:
1) hitting divider while upside down or
2) the car chassis didn't have high score rating that it caved in.

As for the engine, new cars have collapsible mounting like steering wheel to prevent the engine from crashing into passenger compartment. Only in strong impact, the mounting would collapse, should not happen if the impact speed is low or else, it'll be lemon or sub-standard. But since this impact is at high speed, the mount should collapse as the front is almost gone serving as crumple zone, the engine would surely falloff and because of rollover, it is not strange that the engine flew forward at the end point.

Luckily she did not hit anyone other than road divider and had some nice hard rolls. She won't feel physical pain during and moments after the collision. However, when she reached home that night, her muscle will start to ache due to impact concussion shock and would last for few days at least. Most notable pain would come from around her neck-shoulder area followed by other part of her torso.

There has been rumor that P1 gets China to build everything for them ever since MMC ceased providing rebadge. The Saga, Persona/Gen2, Preve, Exora materials, stamping/molding machines, tech provided by China carmakers. You just have to pay China carmaker, telling them what design you want and they will provide you the machines to build the cars and information on material mixture.

Also, survival in crashing is higher than getting slammed at. Cars nowadays are made to pass frontal collision, rollover and side collision. This incident has nothing to be shout of. Mazda and Ford instead have encountered much riskier accident by getting slammed by semi-trucks that lost control at high speed. The Preve roof cave in showed it scored average.