I think for an event like this the non physical effects are very significant
Without discounting the existence of physical factors that may make women better at endurance sports (I wouldn't be surprised if there are some biological perks to having a body that has evolved to carry a human or two constantly for several months), we know that when grit and determination are more important than physical strength, women can win.
I know 3 day eventing is often seen 'posh sport', but there is nothing 'feminine' about being thrown from a horse, and women compete and win against men in solo round the world yacht races.
However, there is no evidence whatsoever that Kolbinger's brillianct performance means that a woman will some day beat Usain Bolt.