There seems to be an agenda there.

If you check wikipedia at least, the muslim-christian population exchange between Greece and Turkey wasn't quite like the article describes it.

The facts may be somewhere in the middle, but certainly not in this article.

FWIW The Critic is associated with the British conservative movement so there is definitely a leaning to the political right

(This is a comment on the magazine that published TFA, not TFA itself)

Could you describe how the muslim-christian population exchange actually happened?

What is the agenda of this piece?

I've pointed you to wikipedia. I'm no historian (trustable or not) so you'll have to document yourself and draw your own conclusions.

Also there is a top level post with a bunch of references now.

I'm still mystified about the agenda of the piece? I'm not implying that it has one or doesn't have one, I'm keen to know what agenda you saw in it.

You say that as if it’s a bad thing.

Not all writing needs to be as dry as a technical bulletin.

That’s how you do a proper propaganda piece, you write an emotional article that is mostly correct and insert subtle nudges to your actual topic :)