I read the linked study, they weren’t testing for immediate comprehension, but rather what tools a reader will utilize and how much effort they were willing to put in before giving up. The testees had access to the internet to look up phrases and titles that they didn’t understand, and as far as I can tell there was no time limit. The “problematic” group included people who thought that there was meant to be a literal dinosaur walking around in the mud, and like half of the people in it never figured out that the setting was a court of chancery.