Is the reporter wrong, physics wrong, and/or am I just misunderstanding something?

Sara Spary wrote the following article: Scientists create diamonds at room temperature in minutes.

”[Researchers] have created two types of diamond at room temperature by using high pressure equivalent to 640 African elephants balancing on the tip of a ballet shoe.”

I don’t understand how so much pressure could be applied to such a small area without generating significant heat? So either (1) Ms. Spray didn’t accurately describe the process, (2) the researchers managed to break physics, or (3) I’m misunderstanding something (possibly all three could be true).