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.

It is usually much easier to use a $5 wrench, ref: http://xkcd.com/538/.