Biodata not matching the passport will result in an immediate cancelled application, whereas missing documents or other minutea will trigger a document request. I think if you read the application carefully you will notice that it says intended or proposed date of arrival and departure.
As Brandon said, request the credit advice slip for each of the relevant months. Failing that, produce the paper trail amounts/dates/method from your origin bank to your Thai bank and hopefully a decent IO will accept the proof as proof. Finally don't leave anything to chance, if your extension/life abroad relies on monthly international deposits being flagged as such, wouldn't you want to check that each and every month?
Oh FFS. If people can't discern what Thai immigration is trying to get across in no uncertain terms then they deserve to be shipped back. At least in the zombie apocalypse movies there is a safe zone. Not so for visa groups where the brain rot seems endless.