While true, you have to be able to afford to fight that battle in court. For years. Against Disney's lawyers. Before you'll be eventually, maybe, found to be correct. In the mean time, you'll go bankrupt long before that.
The important bit that's being overlooked here is that the King Arthur Flour people don't have a trademark for books, video games, art, etc. Their trademark is for baking, baking magazines, flour, etc. It's limited scope. That's not the case with Disney's Mickey Mouse. They have every conceivable trademark filed and they protect them vigorously. Games, software, books, etc. are all covered by Disney's Mickey Mouse trademarks. So this runs afoul of those trademarks.