Yeah, the definitions are actually more about alignment with the US political parties rather than left or right. And since both parties are demonstrably right of center, just to different degrees, the bias meter should only be used to determine which political party’s sponsors likely biased the article.

For example, an article saying climate change is not human caused and presenting debunked evidence will be ranked mostly center and second mostly right. But an article calling for incentives to reduce use of fossils fuels will be ranked mostly left. That’s mostly center if anything. An article calling for the government to explicitly force companies to stop using fossil fuels would be mostly left and center. One further advocating for the government to take over energy companies that don’t comply and make energy production public would be mostly left. Just presenting scientific evidence and refusing to give a voice to debunked “alternative facts” is not a leftist position, it’s a centrist one at best and should be the baseline.