Hmmmm... fascinating, on numerous levels. I'm not saying that I do believe there's an iota of credence to the claim though (which Geoff Elliott of The Abraham Lincoln Blog describes as "bad history" and calls the Bostic Lincoln Center "one of the worst examples I've yet seen").
But I also know that history is never as clean and cut as the books make it out to be. Real life is a messier affair than most published chronicles. After all, we are talking about nothing more or less than people. So who knows?
Just gonna file this one away as a odd anecdote about the life of Lincoln, and pass this along for your perusal :-)