Not wanting to sell your home to a developer makes you greedy these days...nice. I'd be more inclined to believe the homeowner that the offer was never made.
This is an abuse of eminent domain. The city isn't taking those homes to build a highway or a power plant. They are using that power to force them to sell their homes to developers who will make a very large profit from this deal. Is the government going to force the developers and new owners of this mall to share part of the rents they will collect on this property? No, they just want to force out the current owners as cheaply as possible and at the end of a gun if required.
I'd suggest a property owner and their consultant take this stance in the eminent domain hearing. A jury might buy it. I sure do.
I honestly can't see how a court could rule in favor of the city in the first place and allow eminent domain, though.