I feel you. I've written quite a lot of Common Lisp over the years and I've tried to show off its capabilities to co-workers, often in comparison to the language used that that job.
Often I just get "huh, that's neat, now let's get back to mining the coalface".
I have a suspicion that most Lisp articles we see on HN reinforce the perception that this is something other people shouldn't take seriously, much less touch.
This particular post is better than most, and seems like genuine interest, and targeted at people already in the fold, which is fine. Though probably no one else is going see it and think "I gotta get me some of that."
The intentional advocacy posts, on the other hand... I usually don't see them appealing well to even the minority of programmers who are amenable to a low-employability platform. While they seemingly help to keep the platform low-employability, by making a weak pitch in the moment that someone was curious/bored enough to look at that link.
Often I just get "huh, that's neat, now let's get back to mining the coalface".