I feel like author actually considered all your points, but regardless arrives at the same conclusion:

The expected value of an exit interview -for you, the individual- is near-zero or possibly negative.

At the point of your exit interview, you're done with the company. You're no longer part of the team, you're no longer in the family. Your advice and feedback is that of someone who decided to jump ship.

I suppose if you're the absolute top performer at your company and they begged for you to stay, and the VP asked for one last chat to get your advice on how to fix the company... then sure, go for it. Otherwise, just hand over your badge and wish them all the best of luck.