Orphan blocks are a different case than an 2hr shift. When dealing with bitcoin edge cases are very common and sometimes not very well handled. What if half of the miners rejected the block and half accepted the block due to different local times? Then you would have different parts of the network contributing to different forks which is not as cut and dried as an orphan block. It would not be impossible, though highly unlikely.
Don't see how its any different than 2 miners finding blocks at the same time and broadcasting them to the network. Segment "A" and Segment "B" are now forks. If Segment A is first to find the next block, then the tip of Segment B becomes an orphan and convergence happens.