Since this thread is still alive I'll comment.
"When people thought the earth was spherical, they were wrong. "
This is a ridiculous statement. Does he/she mean to say "when people thought the earth was a sphere"? And that it's technically bulgy? Because the Earth is spherical. It's very spherical.
When you take into account the whole earth there is nothing flat about it, but when you think on a scale of human-size, yes it's very flat. I think this is what the article is getting at but it did a very poor job of it IMO.
I guess meant perfectly spherical? Maybe I missed something - could an oblate spheriod be properly called spherical?
And yes, spheres are spheres. Of course it's all about the human sense of scale. That's the whole Flatsy argument - it looks flat, therefore it's completely flat. But for nearly any human scale engineering project, for example, you may as well call it flat and things work fine if you make that assumption (of course "human-scale" means something different that it did 100 years ago).
My point remains; while there is some truth to the statement "the Earth is flat" (true on small scales) and there is some untruth to the statement "the Earth is a sphere", this doesn't mean that the Earth is a flat disc.