Radian made a separate announcement about the Webcast - they want people to know about it and listen! If they were going to give bad news, wouldn't they do what they did before and kinda soft-peddle it?
There's nothing "speshul" or (separate, per se) about it...hence, your conclusion has no basis in fact and...is therefore....conclusory on it's face.
It is usual and customary for RDN, as well as every other listing on the Exchanges to give prior notice to earnings reports and conference calls. Yahoo! simply picked up Radian's news feed of same, on same date, and re-published....same.