it isn't any of these:

Off topic: blog posts, sign-up pages, newsletters, lists, and other reading material. Those can't be tried out, so can't be Show HNs.

it's not reading material.

it's a set of instructions that you can actually try. so i think it fits.

All tutorials are set of instructions. But tutorial blog posts are not Show HNs. If this was a script, or a tool I could run - yes.