I do agree with both of you and it doesn't make any sense that, if I pass the speed margin from the upsets of 25.253, then it is not necessary to have a larger speed margin.
But that change in the AC really annoyed me. And I don't see any reason to just add that paragraph out of the blue.
I'll contact FAA regarding this post.
And what about the VDF/MDF dive procedure? Do you understand that it is necessary to fly the procedures of the design speeds simulation? After reading the requirements and the AC I understand that I may dive as shallow and controllable as possible, deploying high drag devices at the speed that I want to reach.