Saying the Mueller report disproved collusion is disingenuous. Collusion isn't a legal term and and the Mueller report absolutely enumerated communication and coordination between the campaign and Russian agents. I don't think NPR ran anything untrue before during or after the Mueller investigation. They certainly never asserted conclusions without evidence. It was more a fantasy of the right that the MSM was overly credulous of anything.
Hunter Biden's laptop may have been mostly a real thing but it was not and still is not newsworthy. There have been zero revelations from it that weren't public record.
And lab leak also remains a dubious topic. For one, there is no solid proof one way or another. And two I heard more than leak advocate given air time to espouse their theory and answer critical questions.
Honestly my absolute bar none go-to source for dissecting hot button issues and their coverage is On the Media. Technically it's WNYC but I think it's carried in a lot of markets.