Skepticism is healthy in this day and age, but that site is also biased btw. Even the founder says their methodology isn't unbiased.
When determining bias, there isn’t any true scientific formula that is 100% objective. There are objective measures that can be calculated, but ultimately there will be some subjective judgment to determine these. We have put up a scale with a yellow dot on each page that shows the degree of bias for each source. Each page also has a “detailed report” section that gives some details about the source and explains their bias.
When calculating bias, we are looking at political bias, how factual the information is, and links to credible, verifiable sources. Therefore, the yellow dot may indicate political bias or how factual a source is, or in many cases, both. It is important to note that our bias scale is based on the USA political scale, which may differ from other countries. For example, the Democratic Party of the USA is considered centrist or even right-center in many countries worldwide; however, in the USA, they are considered Left-Center. Please keep this in mind if our ratings seem off in your native country. (08/08/2022)
It's a site run by one guy and 3 volunteers. Not really the greatest source.