That requires they (a) notice the camera, (b) dissect the software running it to determine to where it's uploading (which might be a more secure intermediary),

That requires they (a) notice the camera, (b) dissect the software running it to determine to where it's uploading (which might be a more secure intermediary), (c) take action to delete the video, and (d) hope that he doesn't have another service running which backs up the video from S3 in realtime. Yes, the NSA can do that, but it takes time and effort, and given that they couldn't even find/disable one of his mundane alarm systems, it's likely that the wouldn't have disappeared the video evidence.