From the article: “Rather than address every point of every fact check, here is a checklist for things that a thorough fact checker should be able to answer, but can’t or won’t.”
IOW, this is no fact check of the fact checkers, it is just more anti-vaxxer rhetoric masquerading as such.
Sure, whatever you say.
Meanwhile, back at the chemical warfare plant, Vaximilian Vaxalot avoids the questions just as predicted in the very quote he posted.
i.e.
...for things that a thorough fact checker should be able to answer....
But at least he got to say 'anti-vaxxer'.