Can someone explain this masterpiece?

I have the same issue with this case, but I do not understand the details of your post.
My code passes all cases except this one, and when I printed the log I realized it wasn't even my mistake.
As far as i can tell, it expects my program to return False while the expiration date (25) is 20 days after the current date (5).
My porgram returning True instead strikes me as perfectly correct.

Do I simply have to see this as an error made by the designer of this kata and implement it as an exception?

Minor error: The descriptions states that a>b, but in all examples b>a