To be honest, I don't think (and I'm going off the author's name) that english is his first language. Personally, I posted this to HN as it succinctly gave me a quick overview of MR.

I try not to judge an article/blog post on the quality of the grammar when the ideas they are trying to convey are solid and useful.

There are some exceptionally fantastic minds out there that are able to succinctly explain, sometimes difficult, subjects.

I appreciate them for at least trying, and if they explained it in a language that is not their first language, all the more respect to them.