Earlier quoted context omitted.
> Reading comprehension is mostly about subject knowledge Actually reading comprehension is about everything _besides_ subject knowledge. It's about the pure ability to understand something you've read -- e.g. to understand tone, intent, turns of phrase, idioms, writing styles, patterns, argument building, etc -- not about having some particular domain knowledge. In other words if you read an article about a physics…
Yes you can define reading comprehension to mean that. But that's not what the SAT is measuring. Reading comprehension as measured by most tests is largely about background knowledge. https://www.education.com/reference/article/prior-knowledge-... http://www.readingrockets.org/article/building-background-kn... Here's a few articles on the topic with very relevant reference sections if you'd like to know more.
You don't have to define it thusly, though. Whatever SAT tests test for, this is already the dictionary meaning of the term. The except was from Wikipedia.
Here's a dictionary lemma too: comprehension: "a test to find out how well students understand written or spoken language" (listening/reading comprehension).
It's not argued that domain knowledge doesn't factor tremendously in understanding. Just that this is not a reading comprehension intends to measure (heck, the hint is in the very combination of the words that make up the term).
Of course in order to understand some text in a reading comprehension test, domain knowledge will also help.
But reading comprehension is not about any particular domain -- and tests in that don't constraint themselves to only present texts about a specific subject.