This blog in 2 sentences: You can't disprove an hypothesis with another hypothesis - you must provide evidence. Unless you are a taxi driver, a bartender or a barber, you don't have a right to an opinion about a process you've not used (the three aforementioned folks are entitled to opinions about everything).
I have been using leading edge Lean-Agile methods (they were at the time anyway) for 14+ years: XP, Scrum, Lean, Lean-Agile, Kanban, ATDD, TDD, emergent design, ...