NPR has no liberal talk shows. None. They have nothing at all similar to Mark Levin or Dan Bongino or Glen Beck or Sean Hannity, where one host sits for four hours spouting personal political opinion (liberal or otherwise) unchallenged by anyone. There are no such shows done by NPR.
What they have are news shows that cover a wide range of topics, not just politics. They cover the arts, history, economics, sociology, and various other topics. They have in depth world news. In short, they cover a lot of subjects that have nothing to do with either liberal or conservative politics.
So this statement is wrong.