I was thinking about this as I read the article but, it turns out the RtM "integration" is more of a hack than actual integration. It takes away the nicety that is the default reminder interface for Siri/4S/iOS5.
Yes, definitely a hack. Turns out it works well for me since I'd rather have my reminders in the app where I keep track of my tasks and not in a separate Reminders app. But, definitely not a true integration. I can't add tasks without a due date/time and certainly can't indicate other attributes of the task such as priority, tags, etc.