it looks like that the wildcard host rule matching all hosts and pointing to the pathMatcher video-matcher appears by default even without adding any host rule to the url map.
So the current configuration in the documentation is correct.
Yes, based on your provided document, the path routing rules in video-matcher to all incoming requests, regardless of the hostname, due to the * wildcard. It simplifies the setup when you want a consistent routing behavior for all hostnames, directing traffic to the correct backend services based on the URL path.