Ok
I'm sorry I didn't know about this rule.

No, that's a typo because I shortened the array.
Take this correct input array
int[] integers = new int[] { -1721, 169, -32127, -81, 1014, -641 };
and try test solutions
https://www.codewars.com/kata/reviews/56fc1564f8e03b4b9a000027/groups/57606272b2a8d607ee0005d0
https://www.codewars.com/kata/reviews/56fc1564f8e03b4b9a000027/groups/576e7cd74c3204ffb0000635
https://www.codewars.com/kata/reviews/56fc1564f8e03b4b9a000027/groups/621af629f201850001f1f72f
return wrong outlier 169

https://www.codewars.com/kata/reviews/56fc1564f8e03b4b9a000027/groups/5bf3b3feff398649e90006d8
https://www.codewars.com/kata/reviews/56fc1564f8e03b4b9a000027/groups/59621eff72266767b3000042
throws an exception System.InvalidOperationException

and some other solutions

If the input array is like this

int[] integers = new int[] { -1721, 169, -32127, -81, 1014, -641, };

Then some of the solutions in the list give an incorrect "outlier" and some of the solutions throw an exception.