Hmmmmm, I wonder if those that gave Matt grief of his use of chin lock claiming that his use was not the accepted industry standard will do the same here.
The use of margin of error here is not the industry standard.
Who is Matt and what is his pool resume? Has he won any world championships?
I will be happy to try his "chin lock" if he has the hardware to back up his advice. Otherwise I might or might not be inclined to listen to what he has to say. If he is a well known instructor with a lot of happy clients like Scott Lee or Stan Shuffett then I will be more interested in what he as to say. But if he is a B player or a 3 in his local tournament's handicap system then maybe I don't really want to put too much effort into following his advice.
Free passes come with results. The more results you can prove the more of a free pass you get to be a little loose with the vernacular IMO.