Honestly, it really is. I'm not making it up. Seems like they had a problem like this at the Swan a few years back. I guess its not all that uncommon.
http://www.wdwinfo.com/news/Travel_News/Grand_Floridian_treated_for_mold.htm
http://www.wdwinfo.com/news/Travel_News/Grand_Floridian_treated_for_mold.htm