A Note to Terry Gross

Terry Gross hosts a daily radio program called Fresh Air, distributed for National Public Radio. She interviews guests for the better part of her hourly program.

After a break for news and announcements (at the half-hour mark) she says:

“If you just tuned in, my guest is . . .”

Does this mean that if you’ve already been listening her guest is someone else?
Perhaps this malapropism is her trademark, and she doesn’t want to change it?