They could confuse people by explaining that its not hacking in the stricktest sense of the word. They could then go into technical terms about how all of the computers used in the DDoS attack were taken over but again whats the point. I bet that you read plenty of articles that misuse technical terminology but you just don't realise as you don't understand enough to, also it is beside the point.
It *is* hacking. They've hacked the webserver / TCP stack to bend to their will using technical knowledge (admittedly, not difficult in this case).
They haven't 'cracked' it, or broken any security (at least, that we're aware of).
Hacking is the manipulation of hardware and software to your own ends, be it legal or not.