Yes, it's Bob, whom I have dealt with for years, and whom I trust. He has explained that the X bracing in the Shen largely mitigates the main problem with flatbacks, which typically have long braces glued perpendicularly across the back. (Such braces, he says, constrain the back from changing with humidity changes, leading to stress in the wood, which usually leads to some degree of cupping and in the worst case scenarios, braces coming loose or cracks developing in the back.)
Twenty years ago, while studying TB in preparation for the purchase of my first carved bass, I made a Permanent Mental Note: never buy a flatback. They're trouble. If not now, soon.
Of course, Bob can't guarantee I won't have problems with the Shen. If it didn't sound so good, I'd write it off and look for something else, but there don't seem to be all that many options at my price point ($4,750).