When it comes to offering candidates advice for preparing for an interview, keep in mind that the service they offer is to help their clients distinguish unqualified candidates from top performers. So, to this effect, they sometimes contradict offering good advice with poor advice. For example, on one webpage, they recommend finding "a quiet and professional space to perform your interview. This is your time to showcase who you are and what you can add to an organization. Prepare, take a deep breath, and be yourself." Someone who follows this advice will help their assessment model with their aim of identifying top performers for their clients.
But another webpage suggests, "If your dog barks or kid runs across the screen-relax. It's okay. Just relax. Your employer will understand, and if they don't, perhaps it's not the right culture fit for you. And that's okay." Those who take this advice for granted, who don't plan appropriately and put their all in, will help their assessment model identify them as an unqualified candidate.