It is easy to come up with questions that the author would fail in an interview. Simply because there are thousands of minutia details that most senior developers wouldn't know about.

What the interviewer should focus on is the ability to solve real world problems. For example by walking the interviewee through a real world business scenario and letting the interviewee describe how he/she would solve the problem.

This article is a junior engineer’s idea of what a senior engineer should know.

I hate this style of interviewing which is more about the interviewer feeling good about themselves rather than doing their job and assessing candidates. Just wastes everyone's time all around.