Interesting article Megan. Though I completely accept what it says, it's probably beyond the scope of GA flying in a number of places. Keeping to the "private flying" aspect of things, factors such a G loss of consciousness during maneuvering are unlikely, particularly for the flying pilot. If one were to maneuver a normal category GA airplane to the point of Gloc for the pilot, structural damage and loss of control are certain. It's not a CFIT anymore, it's a loss of control - which can happen, but the factors are different. the article and discussion are very worthwhile, though not really relevant to CFIT prevention.
CFIT is prevented by awareness of proximity to terrain - nothing else.
Collision avoidance, in the most extreme last minute case, might be prevented by abrupt maneuvering. But, honestly, if it's come to that point, you're more likely to lose the control you'd like to maintain, by the abrupt maneuvering. It takes a lot of skill to instantly detect the need for abrupt maneuvering, and execute it without exceedance. It'd be easier to apply a fraction of that skill to not needing to do it in the first place.
In the case of close quarters maneuvering, gentle is better. Only as abrupt as is required. And, presuming you're suddenly trying to avoid an obstacle, you want to be really practiced deliberately flying close to things (a challenging skill). If you've errantly got yourself in that tight, use less abrupt maneuvering to not hit the thing, rather than more abrupt maneuvering to give it a wider clearance. There's no point in maneuvering too abruptly and inducing a stall or loss of control to miss it by a mile, when you could have maintained control well, and missed it by enough.
I trained in a particular mountain area in British Columbia (they know mountains there) flying helicopters. I was mentored into a particularly confined looking dead end canyon. (As I measure it on Google earth, it is a mile deep from entry point to the back canyon wall, and 0.8 miles round, 350 feet below the rim, and 400 feet above the descending floor). For a fixed wing pilot like me, that's really tight - but I was being trained in a helicopter, so flying into places like this was more "normal". I worked in this canyon during several training exercises, and got somewhat used to it. (I really never get used to flying toward something I know that I must turn away from, 'cause I cannot out climb it). Anyway, years later, I was est flying a modified deHavilland Beaver amphibian. The very experienced pilot with whom I was flying entered this same canyon - I was terrified! He was calm as normal. I was still terrified!! He gracefully flew around inside this canyon, and back out the way we flew in ('cause there was no other choice!). Then he flipped the control to my side and said "you do it". My slightly subsided terror returned!!! But I did, The trick was to not get phased by it. I flew the wingtip a hundred feet or so off the trees all the way around, in a very gentle (anything but abrupt) turn, and it was fine. I practiced a few more times, and got more relaxed. When I late expressed my fear of doing that, the mentor pilot validated my sense of self preservation, in not doing that kind of thing unsupervised. Then he went on to tell me that that canyon was where he trained water bomber pilots, in much larger (S2F) twin engined water bombers to enter, and not only turn back out, but water bomb down the middle as they exited. So flying the Beaver a lazy circle around there was easy by comparison. I've flown in that area since, but never flown in that canyon again, though possible, and I have proven it to myself, it is still not worth the risk.
But, that was not a CFIT risk, I was well aware of where the terrain was!