I don't know that I exactly use Machado's tip, but the way I use the runway widening illusion doesn't actually change with the width of the runway. I'm not waiting until it's a certain size or anything like that. I've landed at several different widths and lengths as well, and there is always that moment where you are getting close enough to the runway that in your peripheral vision, the runway begins to widen rapidly. Some get really, really wide, and some just get wider, but I've never landed where that didn't happen, so in my personal experience, the width or length doesn't prevent the "cue" from happening.