That pixellation is insecure. If you blur / pixelate to hide details, Apple *can* decipher it. Maybe not letters, but there's only 10 digets in [0:9], and 2x4 pixels with 6 levels of brightness has 48 possibilities, so they can recover it.
Obviously it depends on how determined they are, but a simple black-out is *much* safer.
Obviously it depends on how determined they are, but a simple black-out is *much* safer.