John Seddon loves to complain that if you give a method a name, like "lean," that progress stops and you're codifying method.
His beloved Taiichi Ohno actually gave Toyota's method a name in 1973, calling it the "Toyota Production System", as you can read about here: http://www.gembapantarei.com/2006/07/words_of_taiichi_ohno_sensei_p_1.html
Did Toyota cease to continue evolving TPS after giving it a name?? I think not.
Does Seddon's Vanguard method cease to improve after he adopted the "systems thinking" name or called it the "Vanguard Method"? Seddon publishes training and manuals - does that codify method???