From the paper, page 9:
> The Haskell prototype was written by the second author of this paper, with minor help from the first
Seems like they definitely had a horse in the race!
Regardless, the scorecard itself -- showing Haskell to be one of the winners -- was written by the review panel and not by the author of this paper. Those are the cold facts!
Two more interesting facts:
1- The experiment itself was not designed by the FP community, but was an actual (if simplified) system designed by the Navy. No constraints or requirements were tailored to make things easier for FP; in fact most participants were unfamiliar with FP.
2- A second Haskell prototype was written by an independent programmer, unconnected to the paper's author, who was unfamiliar with Haskell and had to learn it before completing the assignment. I find this very interesting.