First, out of politeness, show a person's personal accomplishment, others will have a good impression on you, even if you don't make it, both sides will be happy;

Second, put yourself in the other person's shoes. If you are a recruiter and say that the interviewer didn't come, what you prepared will be wasted, or will you be embarrassed if you tell the leader that you have an interview and make an appointment for the leader?

Therefore, it's better to say something if you are affectionate and reasonable.