But until Wes told them, they had no evidence that Wes was accessing the data! Or are you saying that they did have evidence, but chose to take a "wait and see" approach to someone gaining control of their entire platform?

No, he claimed _not to have any evidence_ that it did happen.

"Quick, shut off the logging on those servers, so we don't have any record of who logged in on them!"

Alex said they "have no evidence" it happened, which is classic slippery legalese. From that phrase it is reasonable to infer either that they have evidence of absence, or absence of evidence, which are not the same thing.

It's standard wording for something like this even if they had 100% evidence of absence.

Correct. It's the standard wording, whether or not they actually have evidence. Therefore we cannot assume, as you have earlier in this thread, that they do in fact have it.