GP wasn't venturing an opinion on immigration/emigration, he was offering a correction[1] to the poster who thought the article was talking about emigration when it was actually talking about the immigrant population only.

Just like how I am not giving an opinion on the immigration/emigration policies, I'm merely offering (what I think is[2]) a correction to your post.

[1] Maybe his "correction" is wrong, but he is still only talking about stats and not policies.

[2] I could be wrong too, about my interpretation about GPs correction, but that still leaves this post void of opinions on immigration/emigration policies.