He's not English, and his writing reflects that. I'm not sure if it's a mistake. I expect he thinks it's correct. He's writing in a foreign language to his native tongue. I notice a lot of things like that whenever I read his work. I think he misunderstands a lot of things too, because of the language barrier. It can make his stuff quite hard work to read. It's remarkable he's done so well on here really, given that weakness. But some of his health stories are better than his writing advice, which comes across as written by someone struggling with the language.