Oh, the editors are also to blame but he wrote the story and the details in the first place. He should have done his homework.
I don't even care about Steve Rogers or this particular detail but I'm firmly against this logic that would allow writers to tell the stories they want without having to worry about continuity.
Now that I think of it, it's the same disregard for facts that made Havok appear like a huge hypocrite towards Cyclops in Remender's first issue of Uncanny Avengers. Facts that only happened a couple of months before. As I said elsewhere, it would have been ok if it was intentional and someone had called Havok on it. But no, it was just lazy writing.