Your initial chance of being correct does not change no matter how many doors he opened. It stays at essentially zero. I pick the other door because its now a certainty.
Can you explain that?
As I understand it, my initial chance of being correct 1 to n.
My chance of "still" being correct as doors open is 1 to n - doors opened.
What I am not undertstanding is your statment (and the contention of the author) that I have a HIGHER chance of being correct if I switch on the last "choice"