And that in turn puts a very good incentive on companies to design systems where a single employee can't falsify the data!

This is why smart firms require employees to take vacation, and lock out computer access during that time. Many control frauds, particularly in accounting, are discovered when one employee is out and can not cover it up. Much of this would not get started if there is forced disconnect time.

I bribe TWO employees at my competitor ...

Independent validation.

It's not unheard of in manufacturing for random parts to be selected for testing to ensure compliance. In fact, I'd be surprise if this supplier could get away with the same fraud with GM or Ford. One of the side effects of having suppliers design just barely adequate parts is the need to rigorously test that those parts cut only the maximally necessary corners, and not one more.

Yes, this is the real solution, not over the top punishment for suppliers.

and TWO employees at your competitor can point at you for bribing if they get caught.