Nah. Can't be. Larry shoots his mouth off, it sells magazines. He also has never minded saying outragous things if it gets him some publicity.
Hes probably just tying a known event - Yale is home to several traditional naked parties - to Barbara to get some pub. Here is an article from a Yale alumni association:
http://www.yalealumnimagazine.com/is...4/comment.html
A simple search with google turns out several pages of results referring to naked parties at Yale.