According to your post, the FBI would only need to do that if they were "completely incompetent." You wrote, "unless they are completely incompetent, having read out the contents of the chip they should be able to decrypt its contents in a matter of minutes if not seconds." Details matter, and it was fair to call you on your mistake. You shouldn't get all upset now that the ACLU has published a post which gets the details right.
You're right, I got that one detail wrong. Nonetheless, the substance of my post was correct. If every post that had a minor error like this was flagged to death the home page would be empty.