I think the author means, if they ask "any questions for us?" at the top of the hour when the interview is about to end, it implies the interviewer didn't allot

I think the author means, if they ask "any questions for us?" at the top of the hour when the interview is about to end, it implies the interviewer didn't allot any time for the interviewee to ask any questions. According to the author, that implies a lack of courtesy and respect.