Yes, it was confirmed that Giant Squids do really exist! Recently, a dead giant squid was found off coast of Australia, and although it was already dead when Al McGlashan, the author of The Fishing Bible, found it, still this proves that Giant Squid really exist.
This reminds me of the previous episode of Hooked from Discovery Channel, or I think its from NatGeo, that I have watched yesterday where a man (sorry I forgot his name) is "addicted" to finding