I think the point still holds. AI generation has gotten very very good which requires you to look for minute details most people won't know to look for. The small issues you point out are probably easily solved if you really wanted to make them even harder to detect with a post processing model or just eventually improvements. This is just some random blog post too, so it's unlikely they even put that much work into it. I'm sure experts will emerge that will have all those details in mind to make them even harder to detect.