Well, I'm no lawyer, but I question that interpretation, as "authorization" only seems to be a thing in the OGL v1.0a with regard to Section 9.
Well, since a lot of people depended on Section 9 to say they could stay in v1.0a without switching to v1.1 (since Section 9 is also what allows people to mix-and-match license versions with the content they make), authorisation factoring in Section 9 does seem pretty relevant to me.
Also, the "depend on the original living document" aspect of that line of reasoning seems dubious to me. Where in the OGL v1.0a does it suggest that?
I believe the line of reasoning is that, while the OGL copyright notice allows you to mark your game content as under the OGL, the notice itself is, for weird legal shenanigans,
not under the OGL. The license text is under the copyright of WotC, and that means that any reproduction of the OGL by sublicensees still uses the copyrighted notice by Wizards. For instance, this is what Evil Hat Productions' OGL text looks like, even though FATE has nothing to do with D&D:
15 COPYRIGHT NOTICE
Open Game License v 1.0 Copyright 2000, Wizards of the Coast, Inc.
Fate Core System and Fate Accelerated Edition © 2013 by Evil Hat Productions, LLC. Developed, authored, and edited by Leonard Balsera, Brian Engard, Jeremy Keller, Ryan Macklin, Mike Olson, Clark Valentine, Amanda Valentine, Fred Hicks, and Rob Donoghue.
This then seems to imply that the license text itself is something that's separate from the OGL, and the OGL's validity stems from the original copyrighted license text that belongs to Wizards. As a result (the logic goes), if WotC deauthorises OGL v1.0a in a new version of the license, their change trickles down to sublicensees, and this might stop them from issuing OGL v1.0a licenses too.
Of course, this is very, very different from what Dancey & co. intended when they first designed the OGL. But mind you, the people in charge of D&D (and WotC at large) are not those people, and it's the second group that now decides how the OGL should be interpreted. If WotC goes for the worst-case scenario and decides to endanger the entire OGL-dependent side of the industry, things will inevitably go to court. Perhaps WotC might lose and OGL v1.0a might stay because the license was intended to be available forever. But even to get that result, there'd need to be a protracted legal battle against Hasbro. And that can't be good news for the hobby in general.
TL;DR: They're altering the deal. Let's pray they don't alter it further.