I find it far more likely that these girls were being typical pubescent girls and asked Santa about oral sex and when mom saw it they made up a fib...
LOL, perhaps, but if this had really been a case of the bot just parroting lines fed to it I think Microsoft would have been quick to point that out. See the last line in the article about how they changed the auto response to being asked about pizza. It's pretty evident that they really did step in it this time.