Everyone thinks that this exit interview is your last chance for you to let management know that things need to change. Everyone thinks that they are going to be the change catalyst on the way out of the company. You're going to be the hero!

This all sounds a little over the top.

My experience has been that HR was quite clear they would share the feedback I gave in my exit interviews among company leadership to help improve the work environment or culture. Even if it got out more than that, no big deal. (except if we're talking about an extreme case, e.g. an employee leaving due to sexual harassment.) And, given that I had high respect for many that remained at the companies I've left, I willingly gave honest feedback if it might have any chance of improving their work environment after I left.

I respect the author's opinion, but it sounds like unnecessary hyping of exit interviews, and bad advice ("exit interviews are a fraud, they're worthless, so lie!!").