Two things about this from a rank and file ROK Army Special Forces soldier:
1) it is a very candid critique of the ROK Army, with an admission of racial bias. Yes this exists. But the important thing in this is that a former soldier recognizes this and is willing to write about it. Although I cannot prove this it has been my experience over the past 3 decades of working in Korea that the US "after action review" process used in a combined environment has had an effect on the ROK military and has reduced some of the Confucian based mindset that often prevents self-criticism. I have seen many ROK soldiers and officers critically evaluate performance during training exercises and I would bet this soldier experienced that. That does not mean that the Confucian ethic still does not prevail; in many cases it still does. However, exposure to our AAR process over the past few decades has likely had a positive effect (again at least in my anecdotal experience)
2) Note his comments about assessment and preparation. This will be especially important when dealing with north Korea in either a post-regime collapse or post-conflict situation. Every ROK peacekeeping operation around the world will contribute in some way (some small and some large) to the ROK military's ability to prepare for what comes next in north Korea.