The bot seems to use the medibiasfactcheck.com’s API which should report ‘mixed’ factual reporting with extreme right bias.

https://mediabiasfactcheck.com/fox-news-bias/

edit:

seems like there is more data available, the bot could report the MBFC Credibility Rating as well.

Questionable Reasoning: Conspiracy Theories, Pseudoscience, Propaganda, Poor Sources, Numerous Failed Fact Checks
Bias Rating: RIGHT
Factual Reporting: MIXED
Country: USA
MBFC’s Country Freedom Rank: MOSTLY FREE
Media Type: TV Station/Website
Traffic/Popularity: High Traffic
MBFC Credibility Rating: LOW CREDIBILITY

edit2: I was looking for a fox rating by that bot, I wasn’t able to find one “in the wild” but it seems like it does use the MBFC rating for the heading and does indeed classify fox as “Low”

Example from what I guess is the guys development teating posts: https://lemmy.world/post/18064796