Robin's blog post is not only to respond to HN comments (as you may noticed, he addresses an observation made by another commenter on his own blog). And he not

Robin's blog post is not only to respond to HN comments (as you may noticed, he addresses an observation made by another commenter on his own blog). And he not only responds to the comments, but adds plenty of other information and reasons why he suspects optical media is used by Glacier. So no, I don't see anything "meta" about this post.