Ah yes, the ol' matchstick trick....works like a charm
I used to have to "match" a Bouvier in my group who would poop in the back of my Suburban. 3-4 days a week. With 10 other dogs huddled as far away as possible: She apparently saved her poos from the night before for me - we're talking rhino poos
I also had in training a petstore Bichon who finally learned to poo outside thanks to the good ol' matchstick trick.
Also good for very senior dogs who need help to go.
When someone shows you who they are, BELIEVE THEM.
Progress is being made, he will pee pretty much on command now, and I took advantage of him being fast asleep in his bed to go down to the cellar laundry earlier, came back up and find him crying at the top of the stairs, I thought perhaps he was lonely, but when I let him out he only just made 2 steps outside the door before he had to pee, so it seems the connection is being formed, makes life a lot easier, still have a long way to go, but if the basic indoor outdoor thing is round the right way there is hope.