not a bad idea, i do understand Thai and she usually speaks Thai while I speak English at home.
anyhow, her friend just passed the USC test in Syracuse NY a couple of weeks ago and they didn't ask for any explanation of the N400 yes/no questions. i know her friend and I'd say her English is worse than my wife's.
however, we just watched another video,
and part of the reason for failure was not know knowing, or at least not been able to, explain the definitions of the N400 words.
at 19:43 in the above video she is asked "do you know what "cited" means. in the doc you posted it says "A naturalization applicant must only demonstrate an ability to read, write, speak, and understand words in ordinary usage." . personally i wouldn't consider "cited" to be a word in common usage.