I don't know what equation you used to calculate the curvature, but your numbers for the amount of curvature at that distance are off by about a factor of 4. An awfully convenient error to make given the heights of the mountains involved.

More importantly than simple numerical errors, though... don't any other facts about this record-breaking picture - the fact it was taken from a mountaintop to a mountaintop with the early light of sunrise in the backdrop - have any other implications about how the universe is arranged? Doesn't it imply a few things about, say, how far away the Sun is, or the upper limits of what you can do with a zoom lens on flat terrain before "some unknown factor" makes it impossible to shoot from greater distances?

Just getting the math wrong to say the curvature's supposed to be too much to allow this photo to exist requires a lot of not bothering to stop and think about the implications of things.