Does the Java "final" keyword actually improve security?

While there are many reasons to use the 'final' keyword in Java , one of the ones I keep hearing over and over again is that it makes your code more secure. While this seems to make sense in this trivial case:

Behaviour of final static method

I have been playing around with modifiers with static method and came across a weird behaviour.

Modifying final fields in Java

Let's start with a simple test case: