They got right of center-left. This is the same as AP news which is a bulletin that includes moderate and conservative journalists. That site puts basically exclusively local news stations that primarily cover human interest and feel good stories in dead center. Getting just short of least bias in that site is as close to centrist as you can get while still hosting political thought. Not trashing the site, btw. It's really the best way to quickly check the validity of an article from a source you're unfamiliar with.
If you make the argument that this is honestly true bias, you're forfeiting the idea that right wing thought has any credibility. You're accepting the idea that "reality has left wing bias".
Al Gore marvel movie quip