It's useful evidence that EURISKO was doing something. There were some extremely dedicated and obsessive people involved in Traveller, back then. The idea that someone unused to starship combat design of that type could come and develop fleets that won decisively two years in a row seems very unlikely.

It might be that EURISKO acted merely as a generic simulator of strategy and design, and Lenat did all the evaluating, and no one else in the contest had access to simulations of similar utility, which would negate much of the interest in EURISKO, I think.