So reporting based on studies shouldn't be retracted based on faulty data as long as there's a brand new study which has not been vetted to the same standard as the first study which says "pretty much the same thing"?

That kind of viewpoint allows the media to peddle lies 24/7 and never be held accountable for them. Not that it'd stop them anyway, mainstream media is built upon lies (whether outright fabrications or lying by omission).

Studies are not facts. They are a mechanism by which decisions can be guided. That's why on all major issues there are hundreds of peer-reviewed studies on either side saying opposite things.