So how exactly is the credibility score determined? Is it just asking "On a scale of 0 to 10, how credible is this source?"
I just realized, for that particular news article about Regenerative medicine it was my mistake all along. I asked ChatGPT to give unknown sources a score of 1 and completely forgot about. I think that's what it did.
For now it marked only 8 sources as unknown out of 1700.