The fact that it took 6-7 months to pour concrete leads me to believe they were trying to fix something before they finally gave up and went with a complete removal.
Maybe I'm crazy but I do believe there's a photo from Bio from a month or so ago that shows they were trying to fix and keep it as a pad.
UPDATE:
Yeah, as of Dec/Jan, there were still pipes, drains, and stuff. It seems like the beginning of February, it shifted to being completely paved over.