As defined in the article: "when a computer is reset without following proper procedures (what’s known as a cold/hard reboot)"
Even if you disagree, "cold boot attack" is the established name for the actual attack, the new aspect presented here is how to circumvent a certain firmware protection that would overwrite the memory on a cold boot to prevent that attack.
If you would give your definition we could see if it is right, too.
Cold boot attack: An attack in which a running system is reset and information extracted from its memory that survived the reset. Seems like the article is using it correctly.
Even if you disagree, "cold boot attack" is the established name for the actual attack, the new aspect presented here is how to circumvent a certain firmware protection that would overwrite the memory on a cold boot to prevent that attack.
If you would give your definition we could see if it is right, too.