I have just had a quick play with your shot and there is no doubt that you can lighten things up very significantly in such a way that I believe the shot is improved - either by lightening the midtones in 'levels' or using the curve. Now whether this would then lead to an acceptance is a different matter
I think you would then need to reassess the overall quality issues, but I would say that the screener may have been thinking that the shot (as it is) is looking unnecessarily dark - i.e. it could be improved further in editing without compromising the contrast.
All the best.