Id like to give a more specific response to this. Yes, I see the underlined portion of your text. However, what you're citing appears to be written in a context of ancient peoples of the 5th century BC. I'm sure many people are confused about whether or not ancient Greeks believed that earth was flat.
But what I'm saying is that, it's actually not a misconception at all, if the discussion is on ancient peoples of the ancient near east that predate ancient Greece.
You have to understand that I'm pushing us back further in time. We are going deeper.
Anaxamander or aresthothenes, I'm sure I'm misspelling their names, some figures of ancient Greece used things like shadows to discover and to make a case for why the earth was a sphere. And people, they had to discover the spherical shape of the earth.
Nobody just wakes up in the morning and realizes that earth is a sphere. This is a discovery of history and there is a time, if you go back far enough, that you go into a period before the earths shape was discovered. And there is a point in time in which people discovered its shale. And that time was roughly that 5th century timeframe or so with ancient Greece.
But what I'm saying is, we are going back further in time. Before this discovery was made.
People oftentimes don't really think about, or know about just how old the old testament actually is. And it's pretty old. The cosmological perspectives of Genesis date back, at least to 1,000 BC (the Memphite Theology). But really, concepts of Genesis can be found in Egyptian texts going back much further. We're talking 2,000BC, 3,000BC, 4,000BC (pyramid and coffin texts) etc.
And so, we are going back in time, before even ancient Greece. Before Ptolemy or aresthothenes, or anaxamander or...insert X Greece scholar of ancient times.
We are going back, even before them. And that's where we find this "flat" cosmology. It's not flat-earth as is thought of today. It's more like, it's so ancient that people just didn't know and didn't talk about earth the way we do today. They didn't even know what earth was back then. There was no "earth" there was only "land" eretz.
en.m.wikipedia.org
Some archaic biblical hebrew for example, not including earlier oral traditions that background the writing of scripture, date back to something like the 10th century BC.
And your citation or quotation doesn't seem to take this into account.
Whereas my sources, do take this into account. My sources reference ancient literature deeper in time. Back to the time in which the Old Testament originated. Which is centuries earlier than 5th century ancient Greece. Centuries earlier than even Anaximander or Aresthothenes.