Thanks for the comment. I am a sucker for spelling indeed. I usually spend about 1h after publishing each post, to fix typos (I never notice them until it's published, no matter how hard I try).
They would still catch all the incorrect spellings, they just wouldn't catch the incorrect grammar. The grammar of the post is fine, though, so that wouldn't matter too much.
You could even just copy and paste it into a word processor, if you also want to catch grammar issues.