See, this is what I’m talking about. They don’t fact check articles by specific publishers. They fact check a claim. “Is this statement true”, “did X Y”, etc. they don’t do “is this this article by the guardian true.” That’s a whole separate thing not done by them.
They offer a separate service where they rate the general trustworthiness and bias of a publication but that’s not the same as doing a specific article, is it?
Your comment makes me wonder if you might be confusing them with someone else or are intentionally saying something about them that isn’t accurate. Because your comment is incompatible with what they actually do.