When it was first submitted the URL was http://0.0.0.0:4000/ .. that's since been magically fixed (by a mod?). I checked http://www.hydromatic.net and the post wasn't visible their either (most recent was Morel Rust release 0.2.0)
<link rel="canonical" href="http://0.0.0.0:4000/draft-blog/2025/10/26/history-of-lambda-syntax.html" />
.. that the blog is called draft-blog doesn't help either.