What? You think Tina is strange? Not talking to anyone about DBC for 30 years is strange. The Unsolved Mysteries show was filmed during her hiatus from talking. Her first appearance in front of a camera sine 1972 was 2016 - History Channel, Case Closed.
Now, it's Flo who ain't talking. She hasn't spoken to a journalist since 2008 or 2009. Last guy was GG.
As for Alice, she ain't talking to anyone, either, except for Galen Cook, and that was years ago - circa 2015.