One of the most important fundamentals for any Media Outlet should be for its top leadership to well know the internal biases of their people. If this CEO didn’t know this about NPR then she is grossly incompetent.
Occam’s Razor would suggest that she knew she had such a problem and that she decided yo try to mislead Congress now about it.
They don’t believe that being leftist is biased. They really believe it is just truth