Counter: the border agent asks "are you hiding any information from us?". answer yes, and they get you to disable travel mode. answer no, and you just committed a felony.
Literally removing your access to data isn't the same thing as hiding it. Having a TrueCrypt partition on your drive that you can still unlock if you know it's there is hiding it. Securely erasing that partition is not.
Nice mental gymnastics, though. I'm genuinely curious whether the first Federal judge to see this argument laughs or issues a contempt citation first.