Earlier quoted context omitted.
No, because it is not racist. The author has lived in Japan and studied Japanese for a long time. If you read some of his other posts for context you will see that he deeply admires and loves the Japanese people and their culture. This article appears to me to be a cathartic rant about Japanese being so difficult to learn that even many Japanese don't master their own language. I lived in Japan for about 3 years and…
Reminds me of the "I have a black friend" argument. >"It’s probably truer to note that a significant segment of the population isn’t accustomed to reading, or thinking, at an adult level" This claim is ridiculous. There is no way you can construe this as anything other than racist.
Edit: I should mention that I live in a "relatively" small city in Japan (180k inhabitants), that many qualify as "inaka" (countryside), although I wouldn't. So the population of Japanese people I know is not necessarily biased towards highly educated people.