OK, I read that post. It seems consistent with my posts just above. @Steel_Wind is not using "de-authorization" as a term of art, as best I read his post. And he doesn't actually set out an argument as to how WotC might achieve what it wants to achieve - he just states the result.The new one: WotC Talks OGL...Again!
The interpretive argument I've set out is the best one I know of that actually produces, in a legally reasoned manner, the result that WotC appears to be aspiring to.
(Of course I haven't considered the extent to which matters that sit outside the licence - like the FAQ and other conduct by WotC and its officers - might bear upon the interpretive questions. That's part of why I do not suggest that my argument is sound, or even likely - just that it seems to me not hopeless.)