The fundamental problem is that adjusting the regulations for new operations still delivers no equitable relief for people around the site that was let through. An industrial operation shouldn't get an indefinite pass of grandfathered use for finding tricks in the current regulations. Rather the turbines should be shut down in short order (~weeks), and then owners can figure out how to proceed with the foreseeable contingency - wait for the grid operator (or properly incentivize them), deploy their own solar and batteries or some other type of power generation that doesn't produce noise and air pollution externalities, and so on.
The article says that Michael Turner, the vice chair of the county's government, doesn't believe they were trying to find tricks or deceive anyone. That makes it a lot harder to justify shutting them down. And potentially quite expensive, if they or their users can argue the county is liable for the costs.
You mention properly incentivizing the grid operator, but this is also not so simple. As Dominion describes in their FAQ (https://www.dominionenergy.com/virginia/large-business-servi...), providing power to a large datacenter is itself a substantial construction project, requiring its own permits and specialized components. It's not just a matter of paying enough to get some guys working overtime.
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