It is meant as a satire ;) he points out, that all food contains some traces of Chemicals that are considered toxic so why worry about that stuff, if you could only avoid it by starving to death. He just makes fun of all the people going crazy about those frequent notions about something containing harmful substances.
I love that post and was grinning from ear to ear when I read it! I hope you get many more upvotes on that!! Resteemed