If you are saying this course will give the 1050 guys a bigger advantage over the other players than other courses do, that's somewhat testable.
There is a 50% chance the average round rating of all four 1050 guys will exceed the average round rating of the players rated 1020-1040 by more than 24 points.
So, if the difference is only 24 points, there is no evidence the course hurt or helped the 1050 guys.
There is only a 5% chance that the average round rating of all four 1050 guys will exceed the average round rating of the players rated 1020-1040 by more than 38 points.
So, if the difference is more than 38 points, that would be evidence the course gave the 1050 guys a boost.
On the other hand, there is only a 5% chance that the average round rating of all four 1050 guys will exceed the average round rating of the players rated 1020-1040 by only 11 points or less. So, if we see that, it would indicate the course was kryptonite for the 1050 guys.