[YeahNO]

You're right, probably not harmful at all:

"The official, who spoke on condition of anonymity, said some or all of the emails deemed to implicate “special access programs” related to U.S. drone strikes. Those who sent the emails were not involved in directing or approving the strikes, but responded to the fallout from them, the official said.

The information in the emails “was not obtained through a classified product, but is considered ‘per se’ classified” because it pertains to drones, the official added. The U.S. treats drone operations conducted by the CIA as classified, even though in a 2012 internet chat Presidential Barack Obama acknowledged U.S.-directed drone strikes in Pakistan."