I honestly don't see what about this post is Hacker News worthy. Is it just the fact that the post was written by the Minecraft developer? Or it it the (somewhat questionable) display of humility?
It's sort of like posting a long list of your accomplishments and then saying "but I don't consider myself special, and I have much more to learn". If the sentiment was true, you probably wouldn't say it, and almost certainly wouldn't say it this particular way.
There is definitely a star power associated with someone like Notch which automatically gets more views. Same goes for a lot of the people you see get submitted here and voted up.
Is that the only reason? Probably not, but when someone famous says something it will get a lot more attention than if a nobody says it. Cet par.
If you aren't interested in a post, don't vote it up and don't comment on it. This type of meta-commentary is not useful. The (as of right now) 161 votes and 99 comments on this post indicate that it certainly is HN worthy to a significant number of people.
It's sort of like posting a long list of your accomplishments and then saying "but I don't consider myself special, and I have much more to learn". If the sentiment was true, you probably wouldn't say it, and almost certainly wouldn't say it this particular way.