A giant squid could eat a human if the giant squid wanted to eat the human.
However humans are not on the squids list of foods to eat so as long as you avoid the squid the squid will usually avoid the human.
You might get bitten by the squid but it's unlikely that the giant squid or any squid would try to eat the human.
Squid are more interested in attacking their direct prey and humans are not the squids prey so humans are mostly safe when around squids but you should still be cautious when you come up against a squid.
Squid are not really aggressive towards humans unless they see a reason to be aggressive towards the human.
You're generally safe when around squids.
Squids mainly eat things such as fish, crustaceans (like shrimp), crabs and even other squids but humans are not what they want to or like to eat.