Even if it was, that isn't a critique of the comment's argument.
Yes, it is.
The core of their comment is "oh noes western values will be lost!" (Or as they put it: "the global West has values worth preserving for the future").
My point is, no, they won't, because fertility is dropping everywhere. We're not that special. And that this purported fear is simply rooted in age-old racist tropes of a loss of cultural identity to scary foreigners, nothing more.