yea.. thats stretching the word as far as possible i think. Accidental deletion is not a hack in my view. The funds are indeed frozen, and it is indeed possible that there is an actual hack in play here, but the implication from the text is that a user did it, by accident. Thats a flaw in the program code that would allow that to happen "accidentally" by a random new user.
RE: Newbie Hacks Ethereum Parity Wallets for $150 Million.