Google was good.
Then Google was bad.
Then the Democrats lost the election and Google was good again.
As I pointed above, it doesn't seem like Google is even marking stuff has "checked", but marking articles as being themselves "fact checks".
The perception of whether Google is good or not is all that matters. This is how media and mass psychology works. This isn't about fact-checking stories. It's about using Google's brand to deem specific stories to be real or fake.