By the time the gorn were done massacring the colony, there was little to no information there to be obtained. The colonists were all dead, the infrastructure destroyed.
Plus - they maintaned the same behavioural pattern even after they destroyed the colony - trying to kill Kirk&co after luring him into a trap, attacking the enterprise, being unrepentant for their actions, etc.
In other words, no, you don't have evidence that that information was obtained before they destroyed the colony.
In other words, it's clear they obtained the informtion before destroying the colony.
But, as you always do, you start with ridiculously implausible hypotheticals.
I'm sorry, was I the topic of conversation, or were the Gorn?
And there's a difference between starting with a hypothetical and simply pointing out that there's no evidence for another hypothesis.