Thanks for your inquiry. Currently, there is no way you can achieve this using Aspose.Words. Your request has been linked to the appropriate issue in our issue tracking system. The issue ID is WORDSNET-3339. You will be notified as soon as this feature is available. Sorry for the inconvenience.
Actually, this is not a problem. This is expected that generator name is there in the output documents. We will consider providing an ability to control generator name sometime in future, but no promises right now.