Arrogance seems to have creped into the writing world and instead of helping people improve their writing, some writers only critique people based on grammar and spelling.
The blog goes on to refer the reader to an article written by the author. Here is the opening of the article:
Too much emphasis is put on the structure, grammar, and spelling in writing. People need to look past all the mechanics of writing.
Um, yeah, that's like saying an engineer doesn't need to worry about math or a doctor about anatomy. There is definitely more to good prose than just spelling and grammar, but you can't have good prose without them.
Have you ever noticed that the people who complain the loudest about too much emphasis on spelling and grammar are the ones who are the worst at it? Sounds like sour grapes to me.