I am fine with calling it a lie. I have no problem telling lies to my players if it benefits the story/adventure. I very rarely, if ever, do it, but that's another matter.
I agree it is another matter. And one that logically I would have no reason to think the DM would be honest about anyway. I would have no logical reason to take seriously an assement from a DM about how often he lies when he believes that he is justified in lying. The very reasons that he uses to justify lying to his players would be justification for lying to me about his lying as well.
Also it's only bad DM'ing according to you. Apparently, Mr James Wyatt, Gary Gygax and at least me think it's okay to lie/cheat within the game once in a while. I am sure there are plenty more people out there that agree with us.
Well, as I've said before, Wyatt had already established *other* principles about what good DMing meant that he AFAICT is contradicting with this bit of advice. So Mr James Wyatt also disagrees with Mr James Wyatt.
If you were even vaguely familiar with this thread, you'd know that other folks agree with me on at least some of these issues as well. This line of yours is really not even "reasoning".
And this is DnD, there's no King of DnD. So appeals to authority aren't relevant to me unless you think they made a particularly interesting argument. And if so, feel free to tell me what it was.
And if you think this advice is ok because James Wyatt gave the advice to you, then follow it. But why bother pretending to me that your position is based on any reasoning? Just follow his advice, and don't bother trying to understand what I wrote because I'm not James Wyatt so it doesn't matter, right?