Interesting story indeed...
Back in the Stone Age, a senior guy from an airplane company not a million miles from Foat Wuff told me how they were breaking "agility" down into two components: Maneuverability, measured by the established Boydian things like Ps, wing loading and T/W, and controllability, which meant removing envelope limits, being able to roll at high alpha (which was a limitation on his main product at the time), and generally being able to change energy states quickly and in a way of your own choosing.
FW's always been good at flight controls, so it is hardly surprising that a postively-to-neutrally stable airplane with big aft H-tails has a big controllable envelope.
But apparently the program doesn't want to talk about the classic Boydian measures, or about how quickly you can get out of a high-alpha low-airspeed position (that is, you don't want to be a grape). However, they do seem to be scrabbling around for marginal improvements by tinkering with control laws, which tells its own story, does it not?
Note that the FW conversation cited above was around the time that MiGs were doing tailslides and Sus were doing cobras, and the rip against those was in terms of controllability - you could do it but everyone knew where you were going next. The Su-35 shows how that has been fixed with 3-axis vectoring and integrated thrust/vector/aero control.