That may be debatable depending on the 100. Almost every rental car is 1-2 years old, and has all the latest safety features. A '98 LC has two airbags, mass, and ABS. When it comes to safety, newer (more features to prevent accidents) and heavier wins.
That's great news.
Crash test results are based on a car of equivalent mass. A POS Cruze will not get a 5 star rating after getting hit by an SUV.