This ruling isn't about legal interpretations or the rights of plaintiffs — the conservative majority simply wanted to give businesses the ability to sue the federal government out of existence. Now that agencies tasked with protecting our food, water, and workplaces are set to face an onslaught of right-wing lawsuits, it's incumbent upon Congress to codify the proper statute of limitations into law again.
The Administrative Procedure Act states that the six-year statute of limitations begins when "the right of action first accrues." Since the right of action is talking about the right of a plaintiff to sue for injury, that right can only possibly begin once a business is under the purview of the regulation. Even the Fed has acknowledged this fact, and it's shown no evidence that the wording of the law means anything different in this case.