A quick search on YouTube reveals a lot of competitive PL deadlifts, and you'll see very few of them, if any, that look like that perfect "clean" style deadlift on the CF video.
I'm not sure exactly what you're getting at...are you saying that since people striving for competitive totals have a breakdown in form that it would be better to give that as a demonstration for the movement? I've always held my clients to a very high level of proper form, especially during maximum efforts. If any of those individual points begins to deteriorate the lift stops and we drop weight until we fix it. The only place where my own deadlift changes when I get near maximal weights is I use a switch-grip, but otherwise the movement remains the same.