Based on what I've been hearing from some locals who were working on the site construction is that Cumulus Data is contractually obligated to dedicate a certain percentage of the output of that facility to bitcoin but they're free to do with the remaining resources as they want (hence "big data warehousing" being shopped around).

Construction on the site was halted for several months right after bitcoin tanked. Crews were told it was becuase they were re-evaluating continuation of the project.