Asking for a source isn't "blowing the disinformation whistle". It is a healthy thing. We should be skeptical about what we read on anonymous forums. Curiosity to know more and attempts to vet information is a good thing.

Also the source doesn't back up the claim at all. The linked article:

1. Isn't about NPR. It was about some affiliate Corporation for Public Broadcasting TV stations.

2. Points out it wasn't exclusive about selling to democrat campaigns. As mentioned in the article, Bob Dole's campaign was involved.