I don't think writing an article about hackernews comments from two years ago is exactly what I'd call a lesson in ignoring the haters, but this reads a little bit like someone writing an article about the roaring success of null references after their adoption. despite popularity, most of the technical comments in that original thread aren't wrong. 'Popular', 'Easy to adopt' and 'a very bad idea' can be overlapping…
The haters were also wrong. They completely misunderstood the needs of the target audience for JSON5. They forgot the world is a messy place, no matter how clean and clear the JSON spec may be, the input from random users may well be messy...
I'm guessing even you simplify your life by using autocorrect and spell check from time to time. Autocorrect has its issues too, it probably makes us lazy and sloppy, but on the whole, it improves the input experience for a lot of users, so on balance, people choose to keep it around.