I've built at least 20 guitars now with true flat tops. I'll have to disagree that the tops will break in short time. My understanding of arching tops was more for changes in humidity then for structural purposes though it probably acts as both. But there are many small shop luthiers that build true flat tops.
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As was mentioned it's a bit hard to tell in the pic,a shot with a straight edge would help. I do see what you are saying and it could be cause for concern but probably not. If you live in the desert then get a humidifier and use it regularly with the guitar in the case and see if it changes anything. You might want to look around inside at the bracing too with a good light source and a mirror. Do that with string tension on and off.
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