Just tried it, so doesn’t work on cruise control, so turned that off, (also heating and lights off) then found a big hill and let off the throttle. Engine rpm dropped to 800rpm, and eco in a little circle popped up (like the stop/start icon and in the same place), thought maybe the stop start conditions wasn’t right until I stopped about a minute down the road and stop/start turn off the engine
That’s on a MK7 facelift