There is no way of knowing that if Big Bang if in fact, it did happen to produce infinite heat. The researchers were just trying to theorize that the miniature experiment closely resembled the conditions of the original big band. My point of view, if you read it, was given:

However, there is no way of confirming the claim that this is the miniature replication of the big bang unless we can go back in time to find the exact conditions which originally produced this kind of reaction.