It is still an error and the error is not acceptable. If you want to eliminate unofficial election returns, I am completely on board with that. However, if you are going to do them, you do it right. Forgetting to include an entire city in a reported result, unofficial or not, is just not acceptable.
If it takes a week or more to get it right, so be it. Make sure it’s right before announcing the results.
Either way I’m sure you agree that it was not appropriate for Kloppenburg to declare victory and make a victory speech based on unofficial media data that showed the race too close to call. The margin was so small that just a couple of votes here and there statewide could change the outcome. It appears based on the article Prosser had already overtaken her by a handful of votes as official totals trickled in - even without this Waukesha issue.