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This is a blog post with a "Create Free Account" button, not a Show HN:

"Off topic: blog posts, sign-up pages, newsletters, lists, and other reading material."

"Show HN is for something you've made that other people can play with. HN users can try it out, give you feedback, and ask questions in the thread."

We made it, you can play with it :)

What is the point of quoting the introductory sentence of a page full of rules?

If that was the only thing about a Show HN, every corporate blog post would be a Show HN. They all have products you can try out after signing up.

There is certainly some gray area around what constitutes a Show HN. But the link you submitted clearly is a blog post.