> You don’t need to understand the subject matter to make rudimentary assessments of validity.
Possibly for really rudimentary assessments, but do you have any evidence for this? The book source in my original comment is package with peer-reviewed research on this. One study in the book is about college-educated participants that aren't baseball fans scoring worse on a reading comprehension test than non-college educated labourers who were baseball fans when the subject matter is baseball.
Really, each of the questions you list all require knowledge to answer. The latter you could say just requires literacy but that is knowledge it's not some skill you can divorce from domain-specific concepts.
> Are some obvious questions not being raised by the text?
How could doing this be some generalisable ability divorced from knowledge about the content of the text and the domain(s) of concern in the text? Without even looking at the scientific research it seems pretty implausible that you could train a human being to pick out "obvious questions" of import to some text about the 2nd World War if you ensured to keep them ignorant of knowledge about France, Nazi Germany, Nationalism, War, etc. etc.