Hard reset like makes the phone like out of the box wiped I thought.
That's the factory reset, yes.... but the terminology in that link indicates otherwise. But CB has overtaken the world and confused the issues. Me included.
Generally, when someone in the forums says cold restart, he means pull the battery out. I've never read anyone saying "cold restart" and meaning "wipe." There are many reasons to pull the battery out, very few to wipe.