I think Corjay's point is that, if we assume that those in charge of WoTC are rational economic actors, then we can infer from their changes to the licence that the OGL was not believed by them to be economically beneficial to WoTC. If we also assume that their beliefs are likely to be well-founded (given that they have the best access to relevant data) then we can infer that the OGL actually was not economically beneficial to WoTC.It shows no such thing. It shows that there are different people in charge with different ideas about the direction the company should be going. It does not show that OGL was flawed in any way.
Now some people appear to believe that either (i) those in charge of WoTC are not rational economic actors, or (ii) their beliefs are not well-founded. I think Corjay is also questioning the foundation for those beliefs. In particular, I don't think that Corjay accepts that you can show someone is irrational just by labellling them a "suit". For what it's worth, I'm inclined to agree with Corjay on that point.