It’s worth bearing in mind the difference between a true auto with torque converter & an automatic manual which won’t have auto creep. A surprising number these days are electrically operated manual boxes.
I think personally throwing left foot braking into the mix for a test drive auto newbie is just confusing the matter. There’s nothing wrong with people who do that who do it well BUT the number of nasty accidents up here caused by elderly drivers doing that & accelerating at the same time, foot slips off brake & car shoots off into a shop window as happened in Cromer Morrisons recently.