Yes. The A7 came out after anything I've read on the subject, so it may be more difficult. But really all this means is they need to get the copy without destroying the phone and have some way to put it back. The point isn't to brute force the data somehow, but rather to protect it from being destroyed while the wheels of justice crush you.

I've always thought the way to deal with this is to use a OTP scheme. If you have a one time pad that's as large as your data set (assuming we're talking about some reasonably small number of critical documents here), you could generate the cyphertext from your key and then generate another key that translates your cyphertext into something innocuous - grocery lists or whatever.

There's no way the court could prove the key you gave them isn't the right key.