Yes, it is. For kickstarter, your estimated delivery date should at least approach your actual delivery date. Overruns can happen, and are usually not a big deal, especially for runaway successes like SC, but then it becomes absolutely critical to communicate to backers why the delays have happened. With SC, the true believers are willing to forgive all overruns and indeed throw more money at them, despite CIG consistently underdelivering. That sort of attitude is really rather strange.