More generally, this is the universal playbook when someone wants to dump some megaproject on a community that doesn't want it: This will create X jobs and inject $Y into the local economy. Can you name one case where this actually happened? It's usually very few additional permanent jobs and, particularly for public-works stuff, millions or even billions in extra debt to pay off. But don't worry, this next thing we're working on once we get the local council to issue a permit to bulldoze your local forest, that will bring in jobs, we promise.
Which are exactly the kinds of entities that the trades unions and industry interest groups are most deeply in bed with.
Like, of course it's creating a job. If you create a million 1-year jobs every year, that's a million jobs.
Its no car dealership but probably a reliable source of work-orders. Seems like a "gigascale" datacenter would be a large job for a tradesman to be a subcontractor within and afterward its scale means continuous upgrades/maintenance.
Is there any literature of ongoing economic impact of similar facilities?
A small number of jobs for security guards.
Maybe a tiny number (one to three?) for individuals tasked with actual hardware swapping within the data center itself.
And all of the above assumes the data center owner does not "travel in" the requisite individuals on an "as needed" basis -- in which case the only jobs that may go to the locals is "security guard".
But all of the "sys-admin" management level work can be done remotely.
So the actual number of new jobs that arrive in the locality is likely on the order of 20-30 or fewer.