The article details why it wasn't so basic here. Loudoun County allows datacenters to be built by right without a hearing, because they were understood to be (and IME still usually are) very low-impact on the neighbors. The gas turbines were approved as a temporary power source, but then the local power company Dominion said "temporary" would have to last for years longer than planned. Now they're changing the rules for datacenter approvals to ensure that projects that might end up producing this kind of impact will get the scrutiny they need.
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.
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