NPR talked a lot about investigations into Russian interference in the 2016 election and possible collusion with the Trump campaign while investigations were ongoing, but was "sparse" in its coverage of the Mueller report's finding that there was no credible evidence of such collusion.
Hunter Biden's laptop, containing evidence of influence peddling was deemed non-newsworthy; Berliner believes it was newsworthy.
NPR dismissed the SARS-CoV-2 lab leak hypothesis as a conspiracy theory and failed to report on it seriously. While it is not the leading hypothesis, there's credible evidence for it, and at some points in the past the evidence looked fairly compelling.
These examples are very different from ignoring someone who claims without evidence that strawberries cause cancer, that the 2020 election was rigged, or that wildfires in California were started by Israeli space lasers.