It does not say they died twice, It says they are doubly dead (not only spiritually, But they have fallen from the state of Grace, they heard the word of truth, that could have saved them, and they rejected it. That had it in their grasp and let it go. But nice try
Can the bible contradict itself? How can God say one thing, then go against his own promises?
Oh and PS, Peter denied Jesus 3 times, Did Jesus deny him? Or welcome him with open arms?