I skimmed it and didn't really find any misspellings. The language itself is a little dry though, but thats probably the guy did a literal translation
Better no translation than translation like this. Those who don't know English to read original Paul Graham essays may have wrong impression about Paul and his thoughts from such low quality translations.
And I completely agree that "everyone who follows Hacker News knows English and has seen the original, so this post is clearly redundant".