There's a danger in pedantry -- outsiders can mistake it for "see: there's no consensus that the earth is a sphere!". Having said that, the earth is not an oblate spheroid -- it's very slightly pear-shaped, and has all sorts of mountains and valleys.

To paraphrase Isaac Asimov in his essay The Relativity of Wrong: "The earth is flat" is a pretty good model. "The earth is a sphere" is much better. And "The earth is an oblate spheroid" is just a bit better than that.

So, let us consider the aim of the essay: to debunk the flat earth claim as many ways as possible. I think they did a pretty good job finding data for which the flat earth model is insufficient, but a spherical earth fits quite nicely.