Regardless of what NetDoc may elude to, instructors with an agency (other than PADI) do teach their own way.
There are no allusions or illusions here, although it seems that the point eludes you: PADI, as well as all of the other agencies, regulate HOW we must teach our students. Neither NAUI nor SDI allow me to turn off a student's air at any time. They don't allow me to let my students buddy breathe and ascend. Heck, they don't even allow me to conduct OW training in a cavern or cave environment. What's up with that? Those are simply out of the scope of OW classes and rightfully so! Most of these "rules" have arisen out of student deaths and injuries which have caused all agencies to prescribe what and what not may be taught. At issue here, is an instructor who feels the need to teach in what his agency considers an unsafe manner. Hence the censure by PADI. DCBC can put all the spin on it he wants, but that's the bottom line.
Here are some other silly restrictions put on me by the respective agencies:
I can have only 8 students at a time IF the conditions allow it.
I can only have them do a maximum of three training dives a day.
I MUST keep them above 60 FSW for the duration of their class.
We MUST wear a snorkel during all training dives.
NAUI makes me teach tables to OW students.
I could go on, but suffice it to say, if I teach in a manner that violates these silly rules, there is no insurance company or agency that will cover my butt if I get sued. Unfortunately for DCBC, the same applies to him no matter WHAT agency he uses.