I don't know. If someone wanted to upload a 100-year-old Steam Boat Willie video to YouTube, they shouldn't be sued for describing the video accurately. That is, describing the contents of the video as "Mickey Mouse" is accurate, not unfairly leveraging trademarks to confuse consumers. We shouldn't have to relabel the video Whistle Mouse Drives A Boat.
Trademark doesn't restrict description. It restricts, well, trade. This thread contains numerous references to Disney, an even more valuable trademark than Mickey Mouse, and there's nary a problem.