That's a mischaracterization of the case. In New York v. Trump, the charge was falsifying business records in furtherance of another crime, which is what elevated it to a felony. That isn’t a novel interpretation—New York law has long treated falsification of business records as a misdemeanor unless it’s done to cover up or advance another crime. The prosecution argued that Trump falsified records to hide a campaign finance violation, which is what made it a felony.
As for the idea that these laws were "previously unenforced," that's misleading. Falsifying business records has been prosecuted as a felony in New York many times before, including against other executives. What makes this case unique is the high-profile defendant, not some unprecedented application of the law.
And the claim that the prosecutor herself engaged in inflating asset prices is a distortion. Letitia James, as AG, pursued civil fraud claims against Trump for devaluing his assets for tax purposes while inflating them for loan applications—something Trump himself admitted to in depositions. That’s not the same as falsifying business records.
So no, this isn't some brand-new legal strategy being used against Trump; it's just a matter of finally holding a powerful person accountable under laws that have existed and been applied before.