If they have your data but won't give it to the authorities, the result is the same, isn't it? Unless you're suggesting the authorities aren't fooled, and will pry it out of them? That hasn't been the case so far.
They're asking how do you know they didn't hand the data over but just publicly say they didn't? Or that they agreed to give it to the FBI if the FBI would treat it as a confidential source.
