I can only say that I personally have been told by several lawyers, a DA an assistant DA andca long time local judge....and multiple certified instructors over 3 decades that you instructor is incorrect.This guy is a state instructor. Not a road cop. You do what you want. You and you alone will face the music.
You have ZERO duty to retreat from your home....zero. The floor that you are on is about the dumbest thing I have ever heard.
During my PP class the long time NYS and NRA certified instructor told us, and I quote, "If you fuck with my wife while we are walking down the street, I will fucking kill you."
I laughed out loud.
He was also an ex cop....but a complete idiot with obvious poor advice.