You might be right - as I never saw one - but the project didn't start with a plan to built a spectacular flying sculpture. So they fell first to the planning fallacy (which may not be so much a psychological cognitive bias but the very structure of possible outcomes of everything - the top of the frequency distribution is to the right of the "arrival" time), then to sunk costs which later were half acknowledged, thus making them highly suspicious of trying to resolve a cognitive dissonance (rationalization).

One has to take into account the original prediction to make a probabilistic interpretation...