It's been brought up a few times on ATC by more than one poster so apparently at times it has not been included in some regional theaters' productions. I just read those threads and never commented on them. I don't remember who the posters were. However, I don't recall anyone challenging the accuracy of the claim. The production I saw in '94 was at Chicago's long defunct Candlelight Playhouse.
Threads about Mame are done so often on ATC, it's hard to keep track of everything. The threads about "St. Bridget" may well have been several years ago. I've been posting on this board since '97.