On flippers: why would they go to the trouble of building the house? Doesn't the permit cost extra gil? If they were FC flipping, maybe, but relinquish/relocate flipping would make it kinda pointless, with it being demolished anyway. FC flipping doesn't exactly need the house built, though, and, again, more wasted time/resources for the flipper.

For those reasons, I'd lean towards assuming it's just workshop priority, especially with subs presumably bringing back new mats.