SSDs store data by tunneling charges onto and off of floating gates. I strongly suspect that a TLA entity can recover data from the residual charges just as readily as they can from residual magnetism on a spinning media drive.
Having said that, like many others in this discussion, I'm skeptical of how practical data recovery really is vs. a theoretical issue. I'm guessing that the value of the data has to be extremely high before it would be worth while going to the necessary lengths.
